diff --git a/Fk/ChatAnim/Egg.qml b/Fk/ChatAnim/Egg.qml
index f9ef7260..f5e68da1 100644
--- a/Fk/ChatAnim/Egg.qml
+++ b/Fk/ChatAnim/Egg.qml
@@ -46,7 +46,8 @@ Item {
     }
 
     ScriptAction {
-      script: Backend.playSound("./audio/system/fly" + (Math.floor(Math.random() * 2) + 1));
+      script: Backend.playSound("./audio/system/fly" +
+                                (Math.floor(Math.random() * 2) + 1));
     }
 
     ParallelAnimation {
@@ -91,7 +92,8 @@ Item {
     }
 
     ScriptAction {
-      script: Backend.playSound("./audio/system/egg" + (Math.floor(Math.random() * 2) + 1));
+      script: Backend.playSound("./audio/system/egg" +
+                                (Math.floor(Math.random() * 2) + 1));
     }
 
     ParallelAnimation {
diff --git a/Fk/ChatAnim/Flower.qml b/Fk/ChatAnim/Flower.qml
index 179d744b..738e434e 100644
--- a/Fk/ChatAnim/Flower.qml
+++ b/Fk/ChatAnim/Flower.qml
@@ -43,7 +43,8 @@ Item {
     id: pointToAnimation
     running: false
     ScriptAction {
-      script: Backend.playSound("./audio/system/fly" + (Math.floor(Math.random() * 2) + 1));
+      script: Backend.playSound("./audio/system/fly" +
+                                (Math.floor(Math.random() * 2) + 1));
     }
 
     ParallelAnimation {
@@ -80,7 +81,8 @@ Item {
     }
 
     ScriptAction {
-      script: Backend.playSound("./audio/system/flower" + (Math.floor(Math.random() * 2) + 1));
+      script: Backend.playSound("./audio/system/flower" +
+                                (Math.floor(Math.random() * 2) + 1));
     }
 
     ParallelAnimation {
diff --git a/Fk/ChatAnim/GiantEgg.qml b/Fk/ChatAnim/GiantEgg.qml
index ee784761..26a44869 100644
--- a/Fk/ChatAnim/GiantEgg.qml
+++ b/Fk/ChatAnim/GiantEgg.qml
@@ -46,7 +46,8 @@ Item {
     }
 
     ScriptAction {
-      script: Backend.playSound("./audio/system/fly" + (Math.floor(Math.random() * 2) + 1));
+      script: Backend.playSound("./audio/system/fly" +
+                                (Math.floor(Math.random() * 2) + 1));
     }
 
     ParallelAnimation {
@@ -91,7 +92,8 @@ Item {
     }
 
     ScriptAction {
-      script: Backend.playSound("./audio/system/egg" + (Math.floor(Math.random() * 2) + 1));
+      script: Backend.playSound("./audio/system/egg" +
+                                (Math.floor(Math.random() * 2) + 1));
     }
 
     ParallelAnimation {
diff --git a/Fk/ChatAnim/Shoe.qml b/Fk/ChatAnim/Shoe.qml
index 269d4594..365606cc 100644
--- a/Fk/ChatAnim/Shoe.qml
+++ b/Fk/ChatAnim/Shoe.qml
@@ -64,7 +64,8 @@ Item {
           script: {
             egg.opacity = 0;
             whip.opacity = 1;
-            Backend.playSound("./audio/system/egg" + (Math.floor(Math.random() * 2) + 1));
+            Backend.playSound("./audio/system/egg" +
+                              (Math.floor(Math.random() * 2) + 1));
           }
         }
         PropertyAnimation {
diff --git a/Fk/ChatAnim/Wine.qml b/Fk/ChatAnim/Wine.qml
index e5ebde6e..85b105a1 100644
--- a/Fk/ChatAnim/Wine.qml
+++ b/Fk/ChatAnim/Wine.qml
@@ -27,7 +27,8 @@ Item {
         y: start.y - height / 2 + yOffset
         scale: 0.7
         opacity: 0
-        rotation: (Math.atan(Math.abs(end.y - start.y) / Math.abs(end.x - start.x))
+        rotation: (Math.atan(Math.abs(end.y - start.y)
+          / Math.abs(end.x - start.x))
           / Math.PI * 180 - 90) * (end.x > start.x ? -1 : 1)
       }
 
diff --git a/Fk/Cheat/CardDetail.qml b/Fk/Cheat/CardDetail.qml
index cd069808..5a0eb8c1 100644
--- a/Fk/Cheat/CardDetail.qml
+++ b/Fk/Cheat/CardDetail.qml
@@ -57,7 +57,7 @@ Flickable {
     if (!card) return;
     cardPic.setData(card.toData());
     const name = card.virt_name ? card.virt_name : card.name;
-    screenName.text = Backend.translate(name);
-    skillDesc.text = Backend.translate(":" + name);
+    screenName.text = luatr(name);
+    skillDesc.text = luatr(":" + name);
   }
 }
diff --git a/Fk/Cheat/FreeAssign.qml b/Fk/Cheat/FreeAssign.qml
index 6a610f42..1efcf805 100644
--- a/Fk/Cheat/FreeAssign.qml
+++ b/Fk/Cheat/FreeAssign.qml
@@ -21,12 +21,12 @@ Item {
       ToolButton {
         opacity: stack.depth > 1 ? 1 : 0
         Behavior on opacity { NumberAnimation { duration: 100 } }
-        text: Backend.translate("Back")
+        text: luatr("Back")
         onClicked: stack.pop()
       }
 
       Label {
-        text: Backend.translate("Enable free assign")
+        text: luatr("Enable free assign")
         elide: Label.ElideRight
         horizontalAlignment: Qt.AlignHCenter
         verticalAlignment: Qt.AlignVCenter
@@ -46,12 +46,11 @@ Item {
       }
 
       ToolButton {
-        text: Backend.translate("Search")
+        text: luatr("Search")
         enabled: word.text !== ""
         onClicked: {
           if (stack.depth > 1) stack.pop();
-          generalModel = JSON.parse(Backend.callLuaFunction("SearchAllGenerals",
-            [word.text]));
+          generalModel = lcall("SearchAllGenerals", word.text);
           stack.push(generalList);
           word.text = "";
         }
@@ -88,14 +87,13 @@ Item {
         height: 40
 
         Text {
-          text: Backend.translate(name)
+          text: luatr(name)
           color: "#E4D5A0"
           anchors.centerIn: parent
         }
 
         onClicked: {
-          generalModel = JSON.parse(Backend.callLuaFunction("GetGenerals",
-            [packages.get(index).name]));
+          generalModel = lcall("GetGenerals", packages.get(index).name);
           stack.push(generalList);
         }
       }
@@ -134,7 +132,7 @@ Item {
   }
 
   function load() {
-    const packs = JSON.parse(Backend.callLuaFunction("GetAllGeneralPack", []));
+    const packs = lcall("GetAllGeneralPack");
     packs.forEach((name) => packages.append({ name: name }));
   }
 
diff --git a/Fk/Cheat/GeneralDetail.qml b/Fk/Cheat/GeneralDetail.qml
index 428c3d33..707f7068 100644
--- a/Fk/Cheat/GeneralDetail.qml
+++ b/Fk/Cheat/GeneralDetail.qml
@@ -39,21 +39,23 @@ Flickable {
     skillDesc.text = "";
 
     extra_data.generals.forEach((g) => {
-      const data = JSON.parse(Backend.callLuaFunction("GetGeneralDetail", [g]));
-      skillDesc.append(Backend.translate(data.kingdom) + " " + Backend.translate(g) + " " + data.hp + "/" + data.maxHp);
+      const data = lcall("GetGeneralDetail", g);
+      skillDesc.append(luatr(data.kingdom) + " " + luatr(g) + " " + data.hp +
+                       "/" + data.maxHp);
       if (data.companions.length > 0){
         let ret = '';
-        ret += "<font color=\"slategrey\"><b>" + Backend.translate("Companions") + "</b>: ";
+        ret +="<font color=\"slategrey\"><b>" + luatr("Companions") + "</b>: ";
         data.companions.forEach(t => {
-          ret += Backend.translate(t) + ' '
+          ret += luatr(t) + ' '
         });
         skillDesc.append(ret)
       }
       data.skill.forEach(t => {
-        skillDesc.append("<b>" + Backend.translate(t.name) + "</b>: " + t.description)
+        skillDesc.append("<b>" + luatr(t.name) + "</b>: " + t.description)
       });
       data.related_skill.forEach(t => {
-        skillDesc.append("<font color=\"purple\"><b>" + Backend.translate(t.name) + "</b>: " + t.description + "</font>")
+        skillDesc.append("<font color=\"purple\"><b>" + luatr(t.name) +
+                         "</b>: " + t.description + "</font>")
       });
       skillDesc.append("\n");
     });
diff --git a/Fk/Cheat/PlayerDetail.qml b/Fk/Cheat/PlayerDetail.qml
index a582a993..38088397 100644
--- a/Fk/Cheat/PlayerDetail.qml
+++ b/Fk/Cheat/PlayerDetail.qml
@@ -38,7 +38,7 @@ Flickable {
 
     RowLayout {
       MetroButton {
-        text: Backend.translate("Give Flower")
+        text: luatr("Give Flower")
         onClicked: {
           enabled = false;
           root.givePresent("Flower");
@@ -47,7 +47,7 @@ Flickable {
       }
 
       MetroButton {
-        text: Backend.translate("Give Egg")
+        text: luatr("Give Egg")
         onClicked: {
           enabled = false;
           if (Math.random() < 0.03) {
@@ -60,7 +60,7 @@ Flickable {
       }
 
       MetroButton {
-        text: Backend.translate("Give Wine")
+        text: luatr("Give Wine")
         enabled: Math.random() < 0.3
         onClicked: {
           enabled = false;
@@ -70,7 +70,7 @@ Flickable {
       }
 
       MetroButton {
-        text: Backend.translate("Give Shoe")
+        text: luatr("Give Shoe")
         enabled: Math.random() < 0.3
         onClicked: {
           enabled = false;
@@ -80,7 +80,10 @@ Flickable {
       }
 
       MetroButton {
-        text: config.blockedUsers.indexOf(screenName.text) === -1 ? Backend.translate("Block Chatter") : Backend.translate("Unblock Chatter")
+        text: {
+          const blocked = !config.blockedUsers.includes(screenName.text);
+          return blocked ? luatr("Block Chatter") : luatr("Unblock Chatter");
+        }
         enabled: pid !== Self.id && pid > 0
         onClicked: {
           const idx = config.blockedUsers.indexOf(screenName.text);
@@ -94,7 +97,7 @@ Flickable {
       }
 
       MetroButton {
-        text: Backend.translate("Kick From Room")
+        text: luatr("Kick From Room")
         visible: !roomScene.isStarted && roomScene.isOwner
         enabled: pid !== Self.id
         onClicked: {
@@ -157,7 +160,7 @@ Flickable {
     skillDesc.text = "";
 
     const id = extra_data.photo.playerid;
-    if (id == 0) return;
+    if (id === 0) return;
     root.pid = id;
 
     screenName.text = extra_data.photo.screenName;
@@ -165,36 +168,34 @@ Flickable {
     deputyChara.name = extra_data.photo.deputyGeneral;
 
     if (!config.observing) {
-      const gamedata = JSON.parse(Backend.callLuaFunction("GetPlayerGameData", [id]));
+      const gamedata = lcall("GetPlayerGameData", id);
       const total = gamedata[0];
       const win = gamedata[1];
       const run = gamedata[2];
       const totalTime = gamedata[3];
       const winRate = (win / total) * 100;
       const runRate = (run / total) * 100;
-      playerGameData.text = total === 0 ? Backend.translate("Newbie") :
-        Backend.translate("Win=%1 Run=%2 Total=%3").arg(winRate.toFixed(2))
+      playerGameData.text = total === 0 ? luatr("Newbie") :
+        luatr("Win=%1 Run=%2 Total=%3").arg(winRate.toFixed(2))
         .arg(runRate.toFixed(2)).arg(total);
 
       const h = (totalTime / 3600).toFixed(2);
       const m = Math.floor(totalTime / 60);
       if (m < 100) {
-        playerGameData.text += " " + Backend.translate("TotalGameTime: %1 min").arg(m);
+        playerGameData.text += " " + luatr("TotalGameTime: %1 min").arg(m);
       } else {
-        playerGameData.text += " " + Backend.translate("TotalGameTime: %1 h").arg(h);
+        playerGameData.text += " " + luatr("TotalGameTime: %1 h").arg(h);
       }
     }
 
-    const data = JSON.parse(Backend.callLuaFunction("GetPlayerSkills", [id]));
-    data.forEach(t => {
-      skillDesc.append("<b>" + Backend.translate(t.name) + "</b>: " + t.description)
+    lcall("GetPlayerSkills", id).forEach(t => {
+      skillDesc.append("<b>" + luatr(t.name) + "</b>: " + t.description)
     });
 
-    const equips = JSON.parse(Backend.callLuaFunction("GetPlayerEquips", [id]));
-    equips.forEach(cid => {
-      const t = JSON.parse(Backend.callLuaFunction("GetCardData", [cid]));
+    lcall("GetPlayerEquips", id).forEach(cid => {
+      const t = lcall("GetCardData", cid);
       skillDesc.append("--------------------");
-      skillDesc.append("<b>" + Backend.translate(t.name) + "</b>: " + Backend.translate(":" + t.name));
+      skillDesc.append("<b>" + luatr(t.name) + "</b>: " + luatr(":" + t.name));
     });
   }
 }
diff --git a/Fk/Cheat/SameConvert.qml b/Fk/Cheat/SameConvert.qml
index 6617ec50..31ccf4ca 100644
--- a/Fk/Cheat/SameConvert.qml
+++ b/Fk/Cheat/SameConvert.qml
@@ -28,13 +28,13 @@ Item {
         ColumnLayout {
           Text {
             color: "#E4D5A0"
-            text: Backend.translate(gname)
+            text: luatr(gname)
           }
           GridLayout {
             columns: 6
 
             Repeater {
-              model: JSON.parse(Backend.callLuaFunction("GetSameGenerals", [gname]))
+              model: lcall("GetSameGenerals", gname)
 
               GeneralCardItem {
                 name: modelData
diff --git a/Fk/Common/Avatar.qml b/Fk/Common/Avatar.qml
index 87eebd52..98444e05 100644
--- a/Fk/Common/Avatar.qml
+++ b/Fk/Common/Avatar.qml
@@ -6,7 +6,8 @@ Image {
 
   width: 64
   height: 64
-  source: SkinBank.getGeneralExtraPic(general, "avatar/") ?? SkinBank.getGeneralPicture(general)
+  source: SkinBank.getGeneralExtraPic(general, "avatar/")
+          ?? SkinBank.getGeneralPicture(general)
   // sourceSize.width: 250
   // sourceSize.height: 292
   property bool useSmallPic: !!SkinBank.getGeneralExtraPic(general, "avatar/")
diff --git a/Fk/Common/AvatarChatBox.qml b/Fk/Common/AvatarChatBox.qml
index b79c4d6a..d089ee43 100644
--- a/Fk/Common/AvatarChatBox.qml
+++ b/Fk/Common/AvatarChatBox.qml
@@ -18,7 +18,8 @@ Rectangle {
       avatar = "__observer";
     }
     chatLogBox.append({
-      avatar: data.general || roomScene.getPhoto(data.sender)?.general || avatar || "unknown",
+      avatar: data.general || roomScene.getPhoto(data.sender)?.general ||
+              avatar || "unknown",
       general: general,
       msg: data.msg,
       userName: data.userName,
@@ -60,7 +61,7 @@ Rectangle {
         anchors.right: !isSelf ? undefined : avatarPic.left
         anchors.margins: 6
         font.pixelSize: 14
-        text: userName + (general ? (" (" + Backend.translate(general) + ")") : "")
+        text: userName + (general ? (" (" + luatr(general) + ")") : "")
           + ' <font color="grey">[' + time + "]</font>"
       }
 
@@ -123,7 +124,8 @@ Rectangle {
           anchors.centerIn: parent
           source: "../../image/emoji/" + index
         }
-        onClicked: chatEdit.insert(chatEdit.cursorPosition, "{emoji" + index + "}");
+        onClicked: chatEdit.insert(chatEdit.cursorPosition,
+                                   "{emoji" + index + "}");
       }
     }
 
@@ -142,14 +144,14 @@ Rectangle {
       delegate: ItemDelegate {
         width: soundSelector.width
         height: 30
-        text: Backend.translate("$" + name + (idx ? idx.toString() : ""))
+        text: luatr("$" + name + (idx ? idx.toString() : ""))
 
         onClicked: {
           opTimer.start();
           const general = roomScene.getPhoto(Self.id).general;
           let skill = "fastchat_m";
           if (general !== "") {
-            const data = JSON.parse(Backend.callLuaFunction("GetGeneralDetail", [general]));
+            const data = lcall("GetGeneralDetail", general);
             const gender = data.gender;
             if (gender !== 1) {
               skill = "fastchat_f";
diff --git a/Fk/Common/ChatBox.qml b/Fk/Common/ChatBox.qml
index 058dae1c..c5a5d041 100644
--- a/Fk/Common/ChatBox.qml
+++ b/Fk/Common/ChatBox.qml
@@ -54,7 +54,8 @@ Rectangle {
           anchors.centerIn: parent
           source: "../../image/emoji/" + index
         }
-        onClicked: chatEdit.insert(chatEdit.cursorPosition, "{emoji" + index + "}");
+        onClicked: chatEdit.insert(chatEdit.cursorPosition,
+                                   "{emoji" + index + "}");
       }
     }
 
@@ -73,14 +74,14 @@ Rectangle {
       delegate: ItemDelegate {
         width: soundSelector.width
         height: 30
-        text: Backend.translate("$" + name + (idx ? idx.toString() : ""))
+        text: luatr("$" + name + (idx ? idx.toString() : ""))
 
         onClicked: {
           opTimer.start();
           const general = roomScene.getPhoto(Self.id).general;
           let skill = "fastchat_m";
           if (general !== "") {
-            const data = JSON.parse(Backend.callLuaFunction("GetGeneralDetail", [general]));
+            const data = lcall("GetGeneralDetail", general);
             const gender = data.gender;
             if (gender !== 1) {
               skill = "fastchat_f";
diff --git a/Fk/LobbyElement/AudioSetting.qml b/Fk/LobbyElement/AudioSetting.qml
index 15ef8489..94a5e6c1 100644
--- a/Fk/LobbyElement/AudioSetting.qml
+++ b/Fk/LobbyElement/AudioSetting.qml
@@ -9,7 +9,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("BGM Volume")
+      text: luatr("BGM Volume")
     }
     Slider {
       Layout.rightMargin: 16
@@ -25,7 +25,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("Effect Volume")
+      text: luatr("Effect Volume")
     }
     Slider {
       Layout.rightMargin: 16
@@ -38,13 +38,13 @@ ColumnLayout {
   }
 
   Switch {
-    text: Backend.translate("Disable message audio")
+    text: luatr("Disable message audio")
     checked: config.disableMsgAudio
     onCheckedChanged: config.disableMsgAudio = checked;
   }
 
   Switch {
-    text: Backend.translate("Hide unselectable cards")
+    text: luatr("Hide unselectable cards")
     checked: config.hideUseless
     onCheckedChanged: {
       config.hideUseless = checked;
diff --git a/Fk/LobbyElement/BGSetting.qml b/Fk/LobbyElement/BGSetting.qml
index f6b279fb..5076ade5 100644
--- a/Fk/LobbyElement/BGSetting.qml
+++ b/Fk/LobbyElement/BGSetting.qml
@@ -10,7 +10,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("Lobby BG")
+      text: luatr("Lobby BG")
     }
     TextField {
       Layout.fillWidth: true
@@ -30,7 +30,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("Room BG")
+      text: luatr("Room BG")
     }
     TextField {
       Layout.fillWidth: true
@@ -50,7 +50,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("Game BGM")
+      text: luatr("Game BGM")
     }
     TextField {
       Layout.fillWidth: true
@@ -70,7 +70,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("Poster Girl")
+      text: luatr("Poster Girl")
     }
     TextField {
       Layout.fillWidth: true
diff --git a/Fk/LobbyElement/BanGeneralSetting.qml b/Fk/LobbyElement/BanGeneralSetting.qml
index 7eac2671..63e6711d 100644
--- a/Fk/LobbyElement/BanGeneralSetting.qml
+++ b/Fk/LobbyElement/BanGeneralSetting.qml
@@ -14,7 +14,7 @@ Item {
       anchors.rightMargin: 8
       spacing: 16
       Text {
-        text: Backend.translate("Ban List")
+        text: luatr("Ban List")
       }
       ComboBox {
         id: banCombo
@@ -30,54 +30,54 @@ Item {
       }
 
       Button {
-        text: Backend.translate("New")
+        text: luatr("New")
         onClicked: {
           const i = config.disableGeneralSchemes.length;
           banComboList.append({
-            name: Backend.translate("List") + (i + 1),
+            name: luatr("List") + (i + 1),
           });
           config.disableGeneralSchemes.push([]);
         }
       }
 
       Button {
-        text: Backend.translate("Clear")
+        text: luatr("Clear")
         onClicked: {
           config.disabledGenerals = [];
         }
       }
 
       Button {
-        text: Backend.translate("Export")
+        text: luatr("Export")
         onClicked: {
           Backend.copyToClipboard(JSON.stringify(config.disabledGenerals));
-          toast.show(Backend.translate("Export Success"));
+          toast.show(luatr("Export Success"));
         }
       }
 
       Button {
-        text: Backend.translate("Import")
+        text: luatr("Import")
         onClicked: {
           const str = Backend.readClipboard();
           let data;
           try {
             data = JSON.parse(str);
           } catch (e) {
-            toast.show(Backend.translate("Not Legal"));
+            toast.show(luatr("Not Legal"));
             return;
           }
           if (!data instanceof Array) {
-            toast.show(Backend.translate("Not JSON"));
+            toast.show(luatr("Not JSON"));
             return;
           }
           let d = [];
           for (let e of data) {
-            if (typeof e === "string" && Backend.translate(e) !== e) {
+            if (typeof e === "string" && luatr(e) !== e) {
               d.push(e);
             }
           }
           config.disabledGenerals = d;
-          toast.show(Backend.translate("Import Success"));
+          toast.show(luatr("Import Success"));
         }
       }
     }
@@ -86,7 +86,7 @@ Item {
       Layout.fillWidth: true
       Layout.margins: 8
       wrapMode: Text.WrapAnywhere
-      text: Backend.translate("Help_Ban_List")
+      text: luatr("Help_Ban_List")
     }
 
     GridView {
@@ -101,9 +101,9 @@ Item {
         width: listView.width
         text: {
           const prefix = modelData.split("__")[0];
-          let name = Backend.translate(modelData);
+          let name = luatr(modelData);
           if (prefix !== modelData) {
-            name += (" (" + Backend.translate(prefix) + ")");
+            name += (" (" + luatr(prefix) + ")");
           }
           return name;
         }
@@ -115,7 +115,7 @@ Item {
   Component.onCompleted: {
     for (let i = 0; i < config.disableGeneralSchemes.length; i++) {
       banComboList.append({
-        name: Backend.translate("List") + (i + 1),
+        name: luatr("List") + (i + 1),
       });
     }
     banCombo.currentIndex = config.disableSchemeIdx;
diff --git a/Fk/LobbyElement/CreateRoom.qml b/Fk/LobbyElement/CreateRoom.qml
index 2449f536..64437deb 100644
--- a/Fk/LobbyElement/CreateRoom.qml
+++ b/Fk/LobbyElement/CreateRoom.qml
@@ -18,13 +18,13 @@ Item {
     width: root.height
     background: Rectangle { color: "#EEEEEEEE" }
     TabButton {
-      text: Backend.translate("General Settings")
+      text: luatr("General Settings")
     }
     TabButton {
-      text: Backend.translate("Package Settings")
+      text: luatr("Package Settings")
     }
     TabButton {
-      text: Backend.translate("Ban General Settings")
+      text: luatr("Ban General Settings")
     }
   }
 
diff --git a/Fk/LobbyElement/EditProfile.qml b/Fk/LobbyElement/EditProfile.qml
index c64651e2..12eeb658 100644
--- a/Fk/LobbyElement/EditProfile.qml
+++ b/Fk/LobbyElement/EditProfile.qml
@@ -17,13 +17,13 @@ Item {
     width: root.height
     background: Rectangle { color: "#EEEEEEEE" }
     TabButton {
-      text: Backend.translate("Userinfo Settings")
+      text: luatr("Userinfo Settings")
     }
     TabButton {
-      text: Backend.translate("BG Settings")
+      text: luatr("BG Settings")
     }
     TabButton {
-      text: Backend.translate("Audio Settings")
+      text: luatr("Audio Settings")
     }
   }
 
diff --git a/Fk/LobbyElement/PersonalSettings.qml b/Fk/LobbyElement/PersonalSettings.qml
index 70bba354..6a852614 100644
--- a/Fk/LobbyElement/PersonalSettings.qml
+++ b/Fk/LobbyElement/PersonalSettings.qml
@@ -23,14 +23,14 @@ Item {
     Text {
       text: {
         config.totalTime;
-        const gamedata = JSON.parse(Backend.callLuaFunction("GetPlayerGameData", [Self.id]));
+        const gamedata = lcall("GetPlayerGameData", Self.id);
         const totalTime = gamedata[3];
         const h = (totalTime / 3600).toFixed(2);
         const m = Math.floor(totalTime / 60);
         if (m < 100) {
-          return Backend.translate("TotalGameTime: %1 min").arg(m);
+          return luatr("TotalGameTime: %1 min").arg(m);
         } else {
-          return Backend.translate("TotalGameTime: %1 h").arg(h);
+          return luatr("TotalGameTime: %1 h").arg(h);
         }
       }
       x: 12; y: 1
diff --git a/Fk/LobbyElement/RoomGeneralSettings.qml b/Fk/LobbyElement/RoomGeneralSettings.qml
index 3e418f3b..ed7cca5b 100644
--- a/Fk/LobbyElement/RoomGeneralSettings.qml
+++ b/Fk/LobbyElement/RoomGeneralSettings.qml
@@ -16,7 +16,7 @@ Flickable {
       anchors.rightMargin: 8
       spacing: 16
       Text {
-        text: Backend.translate("Room Name")
+        text: luatr("Room Name")
       }
       TextField {
         id: roomName
@@ -24,7 +24,7 @@ Flickable {
         font.pixelSize: 18
         Layout.rightMargin: 16
         Layout.fillWidth: true
-        text: Backend.translate("$RoomName").arg(Self.screenName)
+        text: luatr("$RoomName").arg(Self.screenName)
       }
     }
 
@@ -32,7 +32,7 @@ Flickable {
       anchors.rightMargin: 8
       spacing: 16
       Text {
-        text: Backend.translate("Game Mode")
+        text: luatr("Game Mode")
       }
       ComboBox {
         id: gameModeCombo
@@ -57,16 +57,16 @@ Flickable {
       columnSpacing: 20
       columns: 4
       Text {
-        text: Backend.translate("Player num")
+        text: luatr("Player num")
       }
       Text {
-        text: Backend.translate("Select generals num")
+        text: luatr("Select generals num")
       }
       Text {
-        text: Backend.translate("Operation timeout")
+        text: luatr("Operation timeout")
       }
       Text {
-        text: Backend.translate("Luck Card Times")
+        text: luatr("Luck Card Times")
       }
       SpinBox {
         id: playerNum
@@ -114,11 +114,12 @@ Flickable {
       anchors.rightMargin: 8
       visible: {
         //config.disabledPack; // 没什么用，只是为了禁包刷新时刷新visible罢了
-        const avail = JSON.parse(Backend.callLuaFunction("GetAvailableGeneralsNum", []));
-        const ret = avail < config.preferredGeneralNum * config.preferedPlayerNum;
+        const avail = lcall("GetAvailableGeneralsNum");
+        const ret = avail <
+                  config.preferredGeneralNum * config.preferedPlayerNum;
         return ret;
       }
-      text: Backend.translate("No enough generals")
+      text: luatr("No enough generals")
       color: "red"
     }
 
@@ -126,7 +127,7 @@ Flickable {
       anchors.rightMargin: 8
       spacing: 16
       Text {
-        text: Backend.translate("Room Password")
+        text: luatr("Room Password")
       }
       TextField {
         id: roomPassword
@@ -143,13 +144,13 @@ Flickable {
       Switch {
         id: freeAssignCheck
         checked: Debugging ? true : false
-        text: Backend.translate("Enable free assign")
+        text: luatr("Enable free assign")
       }
 
       Switch {
         id: deputyCheck
         checked: Debugging ? true : false
-        text: Backend.translate("Enable deputy general")
+        text: luatr("Enable deputy general")
       }
     }
 
@@ -157,7 +158,7 @@ Flickable {
       anchors.rightMargin: 8
       spacing: 16
       Button {
-        text: Backend.translate("OK")
+        text: luatr("OK")
         enabled: !(warning.visible)
         onClicked: {
           config.saveConf();
@@ -166,10 +167,11 @@ Flickable {
 
           let disabledGenerals = config.disabledGenerals.slice();
           if (disabledGenerals.length) {
-            const availablePack = JSON.parse(Backend.callLuaFunction("GetAllGeneralPack", [])).
+            const availablePack = lcall("GetAllGeneralPack").
               filter((pack) => !config.disabledPack.includes(pack));
             disabledGenerals = disabledGenerals.filter((general) => {
-              return availablePack.find((pack) => JSON.parse(Backend.callLuaFunction("GetGenerals", [pack])).includes(general));
+              return availablePack.find(pack =>
+                lcall("GetGenerals", pack).includes(general));
             });
 
             disabledGenerals = Array.from(new Set(disabledGenerals));
@@ -181,20 +183,22 @@ Flickable {
               disabledPack.push(p);
             }
           });
-          const generalPacks = JSON.parse(Backend.callLuaFunction("GetAllGeneralPack", []));
+          const generalPacks = lcall("GetAllGeneralPack");
           for (let pk of generalPacks) {
             if (disabledPack.includes(pk)) continue;
-            let generals = JSON.parse(Backend.callLuaFunction("GetGenerals", [pk]));
+            let generals = lcall("GetGenerals", pk);
             let t = generals.filter(g => !disabledGenerals.includes(g));
             if (t.length === 0) {
               disabledPack.push(pk);
-              disabledGenerals = disabledGenerals.filter(g1 => !generals.includes(g1));
+              disabledGenerals = disabledGenerals
+                .filter(g1 => !generals.includes(g1));
             }
           }
 
           ClientInstance.notifyServer(
             "CreateRoom",
-            JSON.stringify([roomName.text, playerNum.value, config.preferredTimeout, {
+            JSON.stringify([roomName.text, playerNum.value,
+                            config.preferredTimeout, {
               enableFreeAssign: freeAssignCheck.checked,
               enableDeputy: deputyCheck.checked,
               gameMode: config.preferedMode,
@@ -208,7 +212,7 @@ Flickable {
         }
       }
       Button {
-        text: Backend.translate("Cancel")
+        text: luatr("Cancel")
         onClicked: {
           root.finished();
         }
@@ -216,11 +220,11 @@ Flickable {
     }
 
     Component.onCompleted: {
-      const mode_data = JSON.parse(Backend.callLuaFunction("GetGameModes", []));
+      const mode_data = lcall("GetGameModes");
       let i = 0;
       for (let d of mode_data) {
         gameModeList.append(d);
-        if (d.orig_name == config.preferedMode) {
+        if (d.orig_name === config.preferedMode) {
           gameModeCombo.currentIndex = i;
         }
         i += 1;
@@ -228,9 +232,7 @@ Flickable {
 
       playerNum.value = config.preferedPlayerNum;
 
-      config.disabledPack.forEach(p => {
-        Backend.callLuaFunction("UpdatePackageEnable", [p, false]);
-      });
+      config.disabledPack.forEach(p => lcall("UpdatePackageEnable", p, false));
       config.disabledPackChanged();
     }
   }
diff --git a/Fk/LobbyElement/RoomPackageSettings.qml b/Fk/LobbyElement/RoomPackageSettings.qml
index 7b7edb13..fff8328f 100644
--- a/Fk/LobbyElement/RoomPackageSettings.qml
+++ b/Fk/LobbyElement/RoomPackageSettings.qml
@@ -23,16 +23,16 @@ Flickable {
     anchors.topMargin: 8
 
     Switch {
-      text: Backend.translate("Disable Extension")
+      text: luatr("Disable Extension")
     }
 
     RowLayout {
       Text {
-        text: Backend.translate("General Packages")
+        text: luatr("General Packages")
         font.bold: true
       }
       Button {
-        text: Backend.translate("Select All")
+        text: luatr("Select All")
         onClicked: {
           for (let i = 0; i < gpacks.count; i++) {
             const item = gpacks.itemAt(i);
@@ -41,7 +41,7 @@ Flickable {
         }
       }
       Button {
-        text: Backend.translate("Revert Selection")
+        text: luatr("Revert Selection")
         onClicked: {
           for (let i = 0; i < gpacks.count; i++) {
             const item = gpacks.itemAt(i);
@@ -76,11 +76,11 @@ Flickable {
 
     RowLayout {
       Text {
-        text: Backend.translate("Card Packages")
+        text: luatr("Card Packages")
         font.bold: true
       }
       Button {
-        text: Backend.translate("Select All")
+        text: luatr("Select All")
         onClicked: {
           for (let i = 0; i < cpacks.count; i++) {
             const item = cpacks.itemAt(i);
@@ -89,7 +89,7 @@ Flickable {
         }
       }
       Button {
-        text: Backend.translate("Revert Selection")
+        text: luatr("Revert Selection")
         onClicked: {
           for (let i = 0; i < cpacks.count; i++) {
             const item = cpacks.itemAt(i);
@@ -128,31 +128,32 @@ Flickable {
     } else {
       packs.push(orig_name);
     }
-    Backend.callLuaFunction("UpdatePackageEnable", [orig_name, checked]);
+    lcall("UpdatePackageEnable", orig_name, checked);
     config.disabledPackChanged();
   }
 
   Component.onCompleted: {
     loading = true;
-    const g = JSON.parse(Backend.callLuaFunction("GetAllGeneralPack", []));
-    for (let orig of g) {
+    const g = lcall("GetAllGeneralPack");
+    let orig;
+    for (orig of g) {
       if (config.serverHiddenPacks.includes(orig)) {
         continue;
       }
       gpacklist.append({
-        name: Backend.translate(orig),
+        name: luatr(orig),
         orig_name: orig,
         pkg_enabled: !config.disabledPack.includes(orig),
       });
     }
 
-    const c = JSON.parse(Backend.callLuaFunction("GetAllCardPack", []));
-    for (let orig of c) {
+    const c = lcall("GetAllCardPack");
+    for (orig of c) {
       if (config.serverHiddenPacks.includes(orig)) {
         continue;
       }
       cpacklist.append({
-        name: Backend.translate(orig),
+        name: luatr(orig),
         orig_name: orig,
         pkg_enabled: !config.disabledPack.includes(orig),
       });
diff --git a/Fk/LobbyElement/UserInfo.qml b/Fk/LobbyElement/UserInfo.qml
index c70fa7ac..a634ec81 100644
--- a/Fk/LobbyElement/UserInfo.qml
+++ b/Fk/LobbyElement/UserInfo.qml
@@ -11,7 +11,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("Username")
+      text: luatr("Username")
     }
     Text {
       text: Self.screenName
@@ -28,7 +28,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("Avatar")
+      text: luatr("Avatar")
     }
     TextField {
       id: avatarName
@@ -38,7 +38,7 @@ ColumnLayout {
       Layout.fillWidth: true
     }
     Button {
-      text: Backend.translate("Update Avatar")
+      text: luatr("Update Avatar")
       enabled: avatarName.text !== "" && !opTimer.running
       onClicked: {
         mainWindow.busy = true;
@@ -55,7 +55,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("Old Password")
+      text: luatr("Old Password")
     }
     TextField {
       id: oldPassword
@@ -70,7 +70,7 @@ ColumnLayout {
     anchors.rightMargin: 8
     spacing: 16
     Text {
-      text: Backend.translate("New Password")
+      text: luatr("New Password")
     }
     TextField {
       id: newPassword
@@ -79,8 +79,9 @@ ColumnLayout {
       Layout.fillWidth: true
     }
     Button {
-      text: Backend.translate("Update Password")
-      enabled: oldPassword.text !== "" && newPassword.text !== "" && !opTimer.running
+      text: luatr("Update Password")
+      enabled: oldPassword.text !== "" && newPassword.text !== ""
+               && !opTimer.running
       onClicked: {
         mainWindow.busy = true;
         opTimer.start();
diff --git a/Fk/Logic.js b/Fk/Logic.js
index 01eebe73..5e2ad89d 100644
--- a/Fk/Logic.js
+++ b/Fk/Logic.js
@@ -46,8 +46,8 @@ callbacks["NetworkDelayTest"] = (jsonData) => {
   // jsonData: RSA pub key
   let cipherText;
   let aeskey;
-  if (config.savedPassword[config.serverAddr] !== undefined
-    && config.savedPassword[config.serverAddr].shorten_password === config.password) {
+  const savedPw = config.savedPassword[config.serverAddr];
+  if (savedPw?.shorten_password === config.password) {
     cipherText = config.savedPassword[config.serverAddr].password;
     aeskey = config.savedPassword[config.serverAddr].key;
     config.aeskey = aeskey ?? "";
@@ -173,7 +173,7 @@ callbacks["Chat"] = (jsonData) => {
   const data = JSON.parse(jsonData);
   const pid = data.sender;
   const userName = data.userName;
-  const general = Backend.translate(data.general);
+  const general = luatr(data.general);
   const time = data.time;
   const msg = data.msg;
 
@@ -181,10 +181,13 @@ callbacks["Chat"] = (jsonData) => {
     return;
   }
 
+  let text;
   if (general === "")
-    current.addToChat(pid, data, `<font color="#3598E8">[${time}] ${userName}:</font> ${msg}`);
+    text = `<font color="#3598E8">[${time}] ${userName}:</font> ${msg}`;
   else
-    current.addToChat(pid, data, `<font color="#3598E8">[${time}] ${userName}(${general}):</font> ${msg}`);
+    text = `<font color="#3598E8">[${time}] ${userName}` +
+           `(${general}):</font> ${msg}`;
+  current.addToChat(pid, data, text);
 }
 
 callbacks["ServerMessage"] = (jsonData) => {
diff --git a/Fk/ModMaker/CreateSomething.qml b/Fk/ModMaker/CreateSomething.qml
index d3cc7485..6db0988c 100644
--- a/Fk/ModMaker/CreateSomething.qml
+++ b/Fk/ModMaker/CreateSomething.qml
@@ -36,7 +36,9 @@ ColumnLayout {
     id: edit
     font.pixelSize: 18
     Layout.fillWidth: true
-    validator: RegularExpressionValidator { regularExpression: /[0-9A-Za-z_]+/ }
+    validator: RegularExpressionValidator {
+      regularExpression: /[0-9A-Za-z_]+/
+    }
   }
 
   Button {
diff --git a/Fk/ModMaker/ModConfig.qml b/Fk/ModMaker/ModConfig.qml
index 51bfc119..2ac5e04a 100644
--- a/Fk/ModMaker/ModConfig.qml
+++ b/Fk/ModMaker/ModConfig.qml
@@ -19,7 +19,8 @@ QtObject {
     conf.email = email;
     conf.modList = modList;
 
-    ModBackend.saveToFile("mymod/config.json", JSON.stringify(conf, undefined, 2));
+    ModBackend.saveToFile("mymod/config.json",
+                          JSON.stringify(conf, undefined, 2));
   }
 
   function addMod(mod) {
diff --git a/Fk/ModMaker/ModDetail.qml b/Fk/ModMaker/ModDetail.qml
index 780d392a..779ec4c9 100644
--- a/Fk/ModMaker/ModDetail.qml
+++ b/Fk/ModMaker/ModDetail.qml
@@ -62,7 +62,8 @@ Item {
           SwipeDelegate.onClicked: deletePackage(modelData);
 
           background: Rectangle {
-            color: deleteLabel.SwipeDelegate.pressed ? Qt.darker("tomato", 1.1) : "tomato"
+            color: deleteLabel.SwipeDelegate.pressed ? Qt.darker("tomato", 1.1)
+                                                     : "tomato"
           }
         }
       }
@@ -118,14 +119,19 @@ Item {
       toast.show(qsTr("cannot use this package name"));
       return;
     }
+
     const path = modPath + new_name + "/";
     ModBackend.mkdir(path);
     mod.packages.push(new_name);
-    ModBackend.saveToFile(modPath + "mod.json", JSON.stringify(mod, undefined, 2));
+    ModBackend.saveToFile(modPath + "mod.json",
+                          JSON.stringify(mod, undefined, 2));
+
     const pkgInfo = {
       name: new_name,
     };
-    ModBackend.saveToFile(path + "pkg.json", JSON.stringify(pkgInfo, undefined, 2));
+    ModBackend.saveToFile(path + "pkg.json",
+                          JSON.stringify(pkgInfo, undefined, 2));
+
     root.modChanged();
   }
 
@@ -133,7 +139,9 @@ Item {
     const path = modPath + name + "/";
     ModBackend.rmrf(path);
     mod.packages.splice(mod.packages.indexOf(name), 1);
-    ModBackend.saveToFile(modPath + "mod.json", JSON.stringify(mod, undefined, 2));
+    ModBackend.saveToFile(modPath + "mod.json",
+                          JSON.stringify(mod, undefined, 2));
+
     root.modChanged();
   }
 }
diff --git a/Fk/ModMaker/ModInit.qml b/Fk/ModMaker/ModInit.qml
index 80a6b569..dd6a6fbe 100644
--- a/Fk/ModMaker/ModInit.qml
+++ b/Fk/ModMaker/ModInit.qml
@@ -84,7 +84,8 @@ Item {
           SwipeDelegate.onClicked: deleteMod(modelData);
 
           background: Rectangle {
-            color: deleteLabel.SwipeDelegate.pressed ? Qt.darker("tomato", 1.1) : "tomato"
+            color: deleteLabel.SwipeDelegate.pressed ? Qt.darker("tomato", 1.1)
+                                                     : "tomato"
           }
         }
       }
@@ -136,7 +137,8 @@ Item {
 
   function createNewMod(name) {
     const banned = [ "test", "standard", "standard_cards", "maneuvering" ];
-    if (banned.indexOf(name) !== -1 || modConfig.modList.indexOf(name) !== -1) {
+    if (banned.indexOf(name) !== -1 ||
+            modConfig.modList.indexOf(name) !== -1) {
       toast.show(qsTr("cannot use this mod name"));
       return;
     }
@@ -146,10 +148,12 @@ Item {
       descrption: "",
       author: modConfig.userName,
     };
-    ModBackend.saveToFile(`mymod/${name}/mod.json`, JSON.stringify(modInfo, undefined, 2));
+    ModBackend.saveToFile(`mymod/${name}/mod.json`,
+                          JSON.stringify(modInfo, undefined, 2));
     ModBackend.saveToFile(`mymod/${name}/.gitignore`, "init.lua");
     ModBackend.stageFiles(name);
-    ModBackend.commitChanges(name, "Initial commit", modConfig.userName, modConfig.email);
+    ModBackend.commitChanges(name, "Initial commit", modConfig.userName,
+                             modConfig.email);
     modConfig.addMod(name);
   }
 
diff --git a/Fk/Pages/About.qml b/Fk/Pages/About.qml
index 19e16c21..a49b6b6c 100644
--- a/Fk/Pages/About.qml
+++ b/Fk/Pages/About.qml
@@ -50,7 +50,7 @@ Item {
               anchors.left: logo.right
               anchors.leftMargin: 16
               width: parent.width * 0.65
-              text: Backend.translate("about_" + dest + "_description")
+              text: luatr("about_" + dest + "_description")
               wrapMode: Text.WordWrap
               textFormat: Text.MarkdownText
               font.pixelSize: 18
@@ -73,7 +73,7 @@ Item {
   }
 
   Button {
-    text: Backend.translate("Quit")
+    text: luatr("Quit")
     anchors.right: parent.right
     onClicked: {
       swipe.opacity = 0;
diff --git a/Fk/Pages/CardsOverview.qml b/Fk/Pages/CardsOverview.qml
index a2716b58..70c95a11 100644
--- a/Fk/Pages/CardsOverview.qml
+++ b/Fk/Pages/CardsOverview.qml
@@ -3,6 +3,7 @@
 import QtQuick
 import QtQuick.Layouts
 import QtQuick.Controls
+import Fk
 import Fk.RoomElement
 
 Item {
@@ -35,7 +36,7 @@ Item {
       height: 40
 
       Text {
-        text: Backend.translate(name)
+        text: luatr(name)
         anchors.centerIn: parent
       }
 
@@ -115,10 +116,9 @@ Item {
       easing.type: Easing.InOutQuad
     }
     onFinished: {
-      const pkg = [listView.model.get(listView.currentIndex).name];
-      const idList = JSON.parse(Backend.callLuaFunction("GetCards", pkg));
-      const cardList = idList.map(id => JSON.parse(Backend.callLuaFunction
-        ("GetCardData",[id])));
+      const pkg = listView.model.get(listView.currentIndex).name;
+      const idList = lcall("GetCards", pkg);
+      const cardList = idList.map(id => lcall("GetCardData", id));
 
       const groupedCardList = [];
       let groupedCards = {};
@@ -194,25 +194,11 @@ Item {
     property int cid: 1
     property var cards
     function updateCard() {
-      const data = JSON.parse(Backend.callLuaFunction("GetCardData", [cid]));
+      const data = lcall("GetCardData", cid);
       const suitTable = {
         spade: "♠", heart: '<font color="red">♥</font>',
         club: "♣", diamond: '<font color="red">♦</font>',
       }
-      const getNumString = n => {
-        switch (n) {
-          case 1:
-            return "A";
-          case 11:
-            return "J";
-          case 12:
-            return "Q";
-          case 13:
-            return "K";
-          default:
-            return n.toString();
-        }
-      }
 
       if (!cards) {
         detailCard.setData(data);
@@ -227,22 +213,21 @@ Item {
       detailCard.known = true;
       cardText.clear();
       audioRow.clear();
-      cardText.append(Backend.translate(":" + data.name));
+      cardText.append(luatr(":" + data.name));
       addCardAudio(data)
-      const skills = JSON.parse(Backend.callLuaFunction
-        ("GetCardSpecialSkills", [cid]));
+      const skills = lcall("GetCardSpecialSkills", cid);
       if (skills.length > 0) {
-        cardText.append("<br/>" + Backend.translate("Special card skills:"));
+        cardText.append("<br/>" + luatr("Special card skills:"));
         skills.forEach(t => {
-          cardText.append("<b>" + Backend.translate(t) + "</b>: "
-            + Backend.translate(":" + t));
+          cardText.append("<b>" + luatr(t) + "</b>: "
+            + luatr(":" + t));
         });
       }
 
       if (cards) {
-        cardText.append("<br/>" + Backend.translate("Every suit & number:"));
+        cardText.append("<br/>" + luatr("Every suit & number:"));
         cardText.append(cards.map(c => {
-          return (suitTable[c.suit] + getNumString(c.number))
+          return (suitTable[c.suit] + Util.convertNumber(c.number))
         }).join(", "));
       }
     }
@@ -303,16 +288,17 @@ Item {
                 verticalAlignment: Text.AlignVCenter
                 text: {
                   if (gender === "male") {
-                    return Backend.translate("Male Audio");
+                    return luatr("Male Audio");
                   } else {
-                    return Backend.translate("Female Audio");
+                    return luatr("Female Audio");
                   }
                 }
                 font.pixelSize: 14
               }
               onClicked: {
-                const data = JSON.parse(Backend.callLuaFunction("GetCardData", [cardDetail.cid]));
-                Backend.playSound("./packages/" + extension + "/audio/card/" + gender + "/" + data.name);
+                const data = lcall("GetCardData", cardDetail.cid);
+                Backend.playSound("./packages/" + extension + "/audio/card/"
+                                  + gender + "/" + data.name);
               }
             }
           }
@@ -322,7 +308,7 @@ Item {
   }
 
   Button {
-    text: Backend.translate("Quit")
+    text: luatr("Quit")
     anchors.right: parent.right
     onClicked: {
       mainStack.pop();
@@ -331,30 +317,32 @@ Item {
 
   function addCardAudio(card) {
     const extension = card.extension;
-    const orig_extension = Backend.callLuaFunction("GetCardExtensionByName", [card.name]);
-    let fname = AppPath + "/packages/" + extension + "/audio/card/male/" + card.name + ".mp3";
+    const orig_extension = lcall("GetCardExtensionByName", card.name);
+    const prefix = AppPath + "/packages/";
+    const suffix = card.name + ".mp3";
+    let fname = prefix + extension + "/audio/card/male/" + suffix;
     if (Backend.exists(fname)) {
-      audioRow.append( {gender: "male", extension: extension} );
+      audioRow.append( { gender: "male", extension: extension } );
     } else {
-      fname = AppPath + "/packages/" + orig_extension + "/audio/card/male/" + card.name + ".mp3";
+      fname = prefix + orig_extension + "/audio/card/male/" + suffix;
       if (Backend.exists(fname)) {
         audioRow.append( {gender: "male", extension: orig_extension} );
       }
     }
-    fname = AppPath + "/packages/" + extension + "/audio/card/female/" + card.name + ".mp3";
+    fname = prefix + extension + "/audio/card/female/" + suffix;
     if (Backend.exists(fname)) {
-      audioRow.append( {gender: "female", extension: extension} );
+      audioRow.append( { gender: "female", extension: extension } );
     }else {
-      fname = AppPath + "/packages/" + orig_extension + "/audio/card/female/" + card.name + ".mp3";
+      fname = prefix + orig_extension + "/audio/card/female/" + suffix;
       if (Backend.exists(fname)) {
-        audioRow.append( {gender: "female", extension: orig_extension} );
+        audioRow.append( { gender: "female", extension: orig_extension } );
       }
     }
   }
 
   function loadPackages() {
     if (loaded) return;
-    const packs = JSON.parse(Backend.callLuaFunction("GetAllCardPack", []));
+    const packs = lcall("GetAllCardPack");
     packs.forEach(name => {
       if (!config.serverHiddenPacks.includes(name)) {
         packages.append({ name: name });
diff --git a/Fk/Pages/GeneralsOverview.qml b/Fk/Pages/GeneralsOverview.qml
index 51fc56a9..d1fae2fd 100644
--- a/Fk/Pages/GeneralsOverview.qml
+++ b/Fk/Pages/GeneralsOverview.qml
@@ -3,6 +3,7 @@
 import QtQuick
 import QtQuick.Layouts
 import QtQuick.Controls
+import Fk
 import Fk.RoomElement
 import "RoomLogic.js" as RoomLogic
 
@@ -36,7 +37,7 @@ Item {
       height: 40
 
       Text {
-        text: Backend.translate(name)
+        text: luatr(name)
         anchors.centerIn: parent
       }
 
@@ -113,11 +114,10 @@ Item {
     }
     onFinished: {
       if (word.text !== "") {
-        gridView.model = JSON.parse(Backend.callLuaFunction("SearchAllGenerals",
-          [word.text]));
+        gridView.model = lcall("SearchAllGenerals", word.text);
       } else {
-        gridView.model = JSON.parse(Backend.callLuaFunction("SearchGenerals",
-          [listView.model.get(listView.currentIndex).name, word.text]));
+        gridView.model = lcall("SearchGenerals",
+          listView.model.get(listView.currentIndex).name, word.text);
       }
       word.text = "";
       appearAnim.start();
@@ -159,7 +159,7 @@ Item {
     property string general: "caocao"
 
     function addSpecialSkillAudio(skill) {
-      const gdata = JSON.parse(Backend.callLuaFunction("GetGeneralData", [general]));
+      const gdata = lcall("GetGeneralData", general);
       const extension = gdata.extension;
       let ret = false;
       for (let i = 0; i < 999; i++) {
@@ -178,7 +178,7 @@ Item {
 
     function addSkillAudio(skill) {
       if (addSpecialSkillAudio(skill)) return;
-      const skilldata = JSON.parse(Backend.callLuaFunction("GetSkillData", [skill]));
+      const skilldata = lcall("GetSkillData", skill);
       if (!skilldata) return;
       const extension = skilldata.extension;
       for (let i = 0; i < 999; i++) {
@@ -194,8 +194,9 @@ Item {
     }
 
     function findDeathAudio(general) {
-      const extension = JSON.parse(Backend.callLuaFunction("GetGeneralData", [general])).extension;
-      const fname = AppPath + "/packages/" + extension + "/audio/death/" + general + ".mp3";
+      const extension = lcall("GetGeneralData", general).extension;
+      const fname = AppPath + "/packages/" + extension + "/audio/death/"
+                  + general + ".mp3";
       if (Backend.exists(fname)) {
         audioDeath.visible = true;
       } else {
@@ -205,27 +206,27 @@ Item {
 
     function updateGeneral() {
       detailGeneralCard.name = general;
-      const data = JSON.parse(Backend.callLuaFunction("GetGeneralDetail", [general]));
+      const data = lcall("GetGeneralDetail", general);
       generalText.clear();
       audioModel.clear();
 
       if (data.companions.length > 0){
-        let ret = '';
-        ret += "<font color=\"slategrey\"><b>" + Backend.translate("Companions") + "</b>: ";
+        let ret = "<font color=\"slategrey\"><b>" + luatr("Companions")
+                + "</b>: ";
         data.companions.forEach(t => {
-          ret += Backend.translate(t) + ' '
+          ret += luatr(t) + ' '
         });
         generalText.append(ret)
       }
 
       data.skill.forEach(t => {
-        generalText.append("<b>" + Backend.translate(t.name) +
+        generalText.append("<b>" + luatr(t.name) +
           "</b>: " + t.description);
 
         addSkillAudio(t.name);
       });
       data.related_skill.forEach(t => {
-        generalText.append("<font color=\"purple\"><b>" + Backend.translate(t.name) +
+        generalText.append("<font color=\"purple\"><b>" + luatr(t.name) +
           "</b>: " + t.description + "</font>");
 
         addSkillAudio(t.name);
@@ -279,7 +280,8 @@ Item {
                   if (name.endsWith("_win_audio")) {
                     return "胜利语音";
                   }
-                  return Backend.translate(name) + (idx ? " (" + idx.toString() + ")" : "");
+                  return luatr(name) + (idx ? " (" + idx.toString() + ")"
+                                            : "");
                 }
                 font.bold: true
                 font.pixelSize: 14
@@ -288,11 +290,12 @@ Item {
                 Layout.fillWidth: true
                 text: {
                   const orig = '$' + name + (idx ? idx.toString() : "");
-                  const orig_trans = Backend.translate(orig);
+                  const orig_trans = luatr(orig);
 
                   // try general specific
-                  const orig_g = '$' + name + '_' + detailGeneralCard.name + (idx ? idx.toString() : "");
-                  const orig_g_trans = Backend.translate(orig_g);
+                  const orig_g = '$' + name + '_' + detailGeneralCard.name
+                               + (idx ? idx.toString() : "");
+                  const orig_g_trans = luatr(orig_g);
 
                   if (orig_g_trans !== orig_g) {
                     return orig_g_trans;
@@ -325,21 +328,29 @@ Item {
           contentItem: ColumnLayout {
             Text {
               Layout.fillWidth: true
-              text: Backend.translate("Death audio")
+              text: luatr("Death audio")
               font.bold: true
               font.pixelSize: 14
             }
             Text {
               Layout.fillWidth: true
-              text: Backend.translate("~" + generalDetail.general) == "~" + generalDetail.general ? "" : Backend.translate("~" + generalDetail.general)
+              text: {
+                const orig = "~" + generalDetail.general;
+                const tr = luatr(orig);
+                if (tr === orig) {
+                  return "";
+                }
+                return tr;
+              }
               wrapMode: Text.WordWrap
             }
           }
 
           onClicked: {
             const general = generalDetail.general
-            const extension = JSON.parse(Backend.callLuaFunction("GetGeneralData", [general])).extension;
-            Backend.playSound("./packages/" + extension + "/audio/death/" + general);
+            const extension = lcall("GetGeneralData", general).extension;
+            Backend.playSound("./packages/" + extension + "/audio/death/"
+                              + general);
           }
         }
       }
@@ -364,7 +375,7 @@ Item {
         }
 
         Button {
-          text: Backend.translate("Search")
+          text: luatr("Search")
           enabled: word.text !== ""
           onClicked: {
             listView.currentIndex = 0;
@@ -378,7 +389,7 @@ Item {
   ColumnLayout {
     anchors.right: parent.right
     Button {
-      text: Backend.translate("Quit")
+      text: luatr("Quit")
       onClicked: {
         mainStack.pop();
         config.saveConf();
@@ -387,14 +398,16 @@ Item {
 
     Button {
       id: banButton
-      text: Backend.translate(config.disabledGenerals.includes(detailGeneralCard.name) ? 'ResumeGeneral' : 'BanGeneral')
+      text: luatr(config.disabledGenerals.includes(detailGeneralCard.name) ?
+                      'ResumeGeneral' : 'BanGeneral')
       visible: detailGeneralCard.name
       onClicked: {
         const { disabledGenerals } = config;
         const { name } = detailGeneralCard;
 
-        if (banButton.text === Backend.translate('ResumeGeneral')) {
-          const deleteIndex = disabledGenerals.findIndex((general) => general === name);
+        if (banButton.text === luatr('ResumeGeneral')) {
+          const deleteIndex = disabledGenerals.findIndex(
+                                (general) => general === name);
           if (deleteIndex === -1) {
             return;
           }
@@ -417,8 +430,9 @@ Item {
     }
 
     Button {
-      text: Backend.translate("Set as Avatar")
-      enabled: detailGeneralCard.name !== "" && !opTimer.running && Self.avatar !== detailGeneralCard.name
+      text: luatr("Set as Avatar")
+      enabled: detailGeneralCard.name !== "" && !opTimer.running
+               && Self.avatar !== detailGeneralCard.name
       onClicked: {
         mainWindow.busy = true;
         opTimer.start();
@@ -432,7 +446,7 @@ Item {
 
   function loadPackages() {
     if (loaded) return;
-    const packs = JSON.parse(Backend.callLuaFunction("GetAllGeneralPack", []));
+    const packs = lcall("GetAllGeneralPack");
     packs.forEach(name => {
       if (!config.serverHiddenPacks.includes(name)) {
         packages.append({ name: name });
diff --git a/Fk/Pages/Init.qml b/Fk/Pages/Init.qml
index 88eb55b9..ea636a9e 100644
--- a/Fk/Pages/Init.qml
+++ b/Fk/Pages/Init.qml
@@ -118,7 +118,8 @@ Item {
 
         TapHandler {
           onTapped: {
-            mainStack.push(Qt.createComponent("../Tutorial.qml").createObject());
+            mainStack.push(Qt.createComponent("../Tutorial.qml")
+                           .createObject());
           }
         }
       }
diff --git a/Fk/Pages/JoinServer.qml b/Fk/Pages/JoinServer.qml
index 70414668..4a716f2b 100644
--- a/Fk/Pages/JoinServer.qml
+++ b/Fk/Pages/JoinServer.qml
@@ -204,7 +204,8 @@ Item {
         Layout.fillWidth: true
         placeholderText: qsTr("Password")
         text: ""
-        echoMode: showPasswordCheck.checked ? TextInput.Normal : TextInput.Password
+        echoMode: showPasswordCheck.checked ? TextInput.Normal
+                                            : TextInput.Password
         passwordCharacter: "*"
       }
 
@@ -215,10 +216,12 @@ Item {
 
       Button {
         Layout.fillWidth: true
-        enabled: serverAddrEdit.text !== "" && screenNameEdit.text !== "" && passwordEdit.text !== ""
+        enabled: serverAddrEdit.text !== "" && screenNameEdit.text !== ""
+                 && passwordEdit.text !== ""
         text: "OK"
         onClicked: {
-          root.addNewServer(serverAddrEdit.text, screenNameEdit.text, passwordEdit.text);
+          root.addNewServer(serverAddrEdit.text, screenNameEdit.text,
+                            passwordEdit.text);
           finished();
         }
       }
@@ -259,7 +262,8 @@ Item {
         Layout.fillWidth: true
         placeholderText: qsTr("Password")
         text: ""
-        echoMode: showPasswordCheck.checked ? TextInput.Normal : TextInput.Password
+        echoMode: showPasswordCheck.checked ? TextInput.Normal
+                                            : TextInput.Password
         passwordCharacter: "*"
       }
 
@@ -371,7 +375,11 @@ Item {
       const item = serverModel.get(i);
       const ip = item.serverIP;
       if (addr.endsWith(ip)) { // endsWith是为了应付IPv6格式的ip
-        item.misMatchMsg = FkVersion === ver ? "" : qsTr("@VersionMismatch").arg(ver);
+        item.misMatchMsg = "";
+        if (FkVersion !== ver) {
+          item.misMatchMsg = qsTr("@VersionMismatch").arg(ver);
+        }
+
         item.description = desc;
         item.favicon = icon;
         item.online = count.toString();
diff --git a/Fk/Pages/Lobby.qml b/Fk/Pages/Lobby.qml
index 9e73489c..6971e25a 100644
--- a/Fk/Pages/Lobby.qml
+++ b/Fk/Pages/Lobby.qml
@@ -41,7 +41,7 @@ Item {
         width: parent.width
         wrapMode: TextEdit.WordWrap
         textFormat: Text.MarkdownText
-        text: config.serverMotd + "\n___\n" + Backend.translate('Bulletin Info')
+        text: config.serverMotd + "\n___\n" + luatr('Bulletin Info')
       }
     }
   }
@@ -64,13 +64,13 @@ Item {
         Text {
           horizontalAlignment: Text.AlignLeft
           Layout.fillWidth: true
-          text: (hasPassword ? Backend.translate("Has Password") : "") + roomName
+          text: (hasPassword ? luatr("Has Password") : "") + roomName
           font.pixelSize: 20
           elide: Label.ElideRight
         }
 
         Text {
-          text: Backend.translate(gameMode)
+          text: luatr(gameMode)
         }
 
         Text {
@@ -81,8 +81,8 @@ Item {
         }
 
         Button {
-          text: (playerNum < capacity) ? Backend.translate("Enter") :
-          Backend.translate("Observe")
+          text: (playerNum < capacity) ? luatr("Enter") :
+          luatr("Observe")
 
           enabled: !opTimer.running
 
@@ -124,7 +124,7 @@ Item {
     height: root.height - 80
     Button {
       Layout.alignment: Qt.AlignRight
-      text: Backend.translate("Refresh Room List")
+      text: luatr("Refresh Room List")
       enabled: !opTimer.running
       onClicked: {
         opTimer.start();
@@ -142,7 +142,7 @@ Item {
         Text {
           width: parent.width
           horizontalAlignment: Text.AlignHCenter
-          text: Backend.translate("Room List").arg(roomModel.count)
+          text: luatr("Room List").arg(roomModel.count)
         }
         ListView {
           id: roomList
@@ -166,9 +166,10 @@ Item {
     width: 120
     display: AbstractButton.TextUnderIcon
     icon.name: "media-playback-start"
-    text: Backend.translate("Create Room")
+    text: luatr("Create Room")
     onClicked: {
-      lobby_dialog.sourceComponent = Qt.createComponent("../LobbyElement/CreateRoom.qml");
+      lobby_dialog.sourceComponent =
+        Qt.createComponent("../LobbyElement/CreateRoom.qml");
       lobby_drawer.open();
       config.observing = false;
       config.replaying = false;
@@ -180,33 +181,33 @@ Item {
     anchors.right: parent.right
     anchors.bottom: parent.bottom
     Button {
-      text: Backend.translate("Generals Overview")
+      text: luatr("Generals Overview")
       onClicked: {
         mainStack.push(mainWindow.generalsOverviewPage);
         mainStack.currentItem.loadPackages();
       }
     }
     Button {
-      text: Backend.translate("Cards Overview")
+      text: luatr("Cards Overview")
       onClicked: {
         mainStack.push(mainWindow.cardsOverviewPage);
         mainStack.currentItem.loadPackages();
       }
     }
     Button {
-      text: Backend.translate("Scenarios Overview")
+      text: luatr("Scenarios Overview")
       onClicked: {
         mainStack.push(mainWindow.modesOverviewPage);
       }
     }
     Button {
-      text: Backend.translate("Replay")
+      text: luatr("Replay")
       onClicked: {
         mainStack.push(mainWindow.replayPage);
       }
     }
     Button {
-      text: Backend.translate("About")
+      text: luatr("About")
       onClicked: {
         mainStack.push(mainWindow.aboutPage);
       }
@@ -216,7 +217,7 @@ Item {
   Button {
     id: exitButton
     anchors.right: parent.right
-    text: Backend.translate("Exit Lobby")
+    text: luatr("Exit Lobby")
     display: AbstractButton.TextBesideIcon
     icon.name: "application-exit"
     onClicked: {
@@ -269,7 +270,7 @@ Item {
       anchors.margins: 16
 
       Text {
-        text: Backend.translate("Please input room's password")
+        text: luatr("Please input room's password")
       }
 
       TextField {
@@ -295,7 +296,7 @@ Item {
     config.replaying = false;
     if (playerNum < capacity) {
       config.observing = false;
-      Backend.callLuaFunction("SetObserving", [false]);
+      lcall("SetObserving", false);
       mainWindow.busy = true;
       ClientInstance.notifyServer(
         "EnterRoom",
@@ -303,7 +304,7 @@ Item {
       );
     } else {
       config.observing = true;
-      Backend.callLuaFunction("SetObserving", [true]);
+      lcall("SetObserving", true);
       mainWindow.busy = true;
       ClientInstance.notifyServer(
         "ObserveRoom",
@@ -334,7 +335,7 @@ Item {
       anchors.horizontalCenter: parent.horizontalCenter
       x: 4; y: 2
       font.pixelSize: 16
-      text: Backend.translate("$OnlineInfo")
+      text: luatr("$OnlineInfo")
         .arg(lobbyPlayerNum).arg(serverPlayerNum) + "\n"
         + "Powered by FreeKill " + FkVersion
     }
@@ -357,8 +358,10 @@ Item {
 
   function addToChat(pid, raw, msg) {
     if (raw.type !== 1) return;
-    msg = msg.replace(/\{emoji([0-9]+)\}/g, '<img src="../../image/emoji/$1.png" height="24" width="24" />');
-    raw.msg = raw.msg.replace(/\{emoji([0-9]+)\}/g, '<img src="../../image/emoji/$1.png" height="24" width="24" />');
+    msg = msg.replace(/\{emoji([0-9]+)\}/g,
+      '<img src="../../image/emoji/$1.png" height="24" width="24" />');
+    raw.msg = raw.msg.replace(/\{emoji([0-9]+)\}/g,
+      '<img src="../../image/emoji/$1.png" height="24" width="24" />');
     lobbyChat.append(msg);
     danmaku.sendLog("<b>" + raw.userName + "</b>: " + raw.msg);
   }
@@ -369,6 +372,6 @@ Item {
   }
 
   Component.onCompleted: {
-    toast.show(Backend.translate("$WelcomeToLobby"));
+    toast.show(luatr("$WelcomeToLobby"));
   }
 }
diff --git a/Fk/Pages/ModesOverview.qml b/Fk/Pages/ModesOverview.qml
index 6001b4f9..d97c84a5 100644
--- a/Fk/Pages/ModesOverview.qml
+++ b/Fk/Pages/ModesOverview.qml
@@ -51,7 +51,7 @@ Item {
           id: modeDesc
           width: parent.width - 16
           wrapMode: Text.WordWrap
-          text: Backend.translate(":" + modeList.get(listView.currentIndex).orig_name)
+          text: luatr(":" + modeList.get(listView.currentIndex).orig_name)
           textFormat: Text.MarkdownText
           font.pixelSize: 16
         }
@@ -60,7 +60,7 @@ Item {
   }
 
   Button {
-    text: Backend.translate("Quit")
+    text: luatr("Quit")
     anchors.bottom: parent.bottom
     onClicked: {
       mainStack.pop();
@@ -68,7 +68,7 @@ Item {
   }
 
   Component.onCompleted: {
-    const mode_data = JSON.parse(Backend.callLuaFunction("GetGameModes", []));
+    const mode_data = lcall("GetGameModes");
     for (let d of mode_data) {
       modeList.append(d);
     }
diff --git a/Fk/Pages/Replay.qml b/Fk/Pages/Replay.qml
index 17261b65..daa26b89 100644
--- a/Fk/Pages/Replay.qml
+++ b/Fk/Pages/Replay.qml
@@ -20,7 +20,7 @@ Item {
         onClicked: mainStack.pop();
       }
       Label {
-        text: Backend.translate("Replay Manager")
+        text: luatr("Replay Manager")
         horizontalAlignment: Qt.AlignHCenter
         Layout.fillWidth: true
       }
@@ -75,8 +75,9 @@ Item {
           Text {
             text: {
               const win = winner.split("+").indexOf(role) !== -1;
-              const winStr = win ? Backend.translate("Game Win") : Backend.translate("Game Lose");
-              return "<b>" + Backend.translate(_general) + "</b> " + Backend.translate(role) + " " + winStr;
+              const winStr = win ? luatr("Game Win") : luatr("Game Lose");
+              return "<b>" + luatr(_general) + "</b> " + luatr(role)
+                   + " " + winStr;
             }
             font.pixelSize: 20
             textFormat: Text.RichText
@@ -89,16 +90,16 @@ Item {
               const h = repDate.slice(8,10);
               const m = repDate.slice(10,12);
               const s = repDate.slice(12,14);
-              const dateStr = y + "-" + month + "-" + d + " " + h + ":" + m + ":" + s;
+              const dateStr = `${y}-${month}-${d} ${h}:${m}:${s}`;
 
-              return playerName + " " + Backend.translate(gameMode) + " " + dateStr
+              return playerName + " " + luatr(gameMode) + " " + dateStr
             }
           }
         }
 
         Button {
           id: replayBtn
-          text: Backend.translate("Play the Replay")
+          text: luatr("Play the Replay")
           anchors.right: delBtn.left
           anchors.rightMargin: 8
           onClicked: {
@@ -110,7 +111,7 @@ Item {
 
         Button {
           id: delBtn
-          text: Backend.translate("Delete Replay")
+          text: luatr("Delete Replay")
           anchors.right: parent.right
           anchors.rightMargin: 8
           onClicked: {
diff --git a/Fk/Pages/Room.qml b/Fk/Pages/Room.qml
index c4844cc8..b83569fc 100644
--- a/Fk/Pages/Room.qml
+++ b/Fk/Pages/Room.qml
@@ -87,7 +87,7 @@ Item {
     anchors.topMargin: 12
     anchors.right: parent.right
     anchors.rightMargin: 12
-    text: Backend.translate("Menu")
+    text: luatr("Menu")
     onClicked: {
       if (menuContainer.visible){
         menuContainer.close();
@@ -103,7 +103,7 @@ Item {
 
       MenuItem {
         id: quitButton
-        text: Backend.translate("Quit")
+        text: luatr("Quit")
         onClicked: {
           if (config.replaying) {
             Backend.controlReplayer("shutdown");
@@ -119,14 +119,18 @@ Item {
       MenuItem {
         id: surrenderButton
         enabled: !config.observing && !config.replaying
-        text: Backend.translate("Surrender")
+        text: luatr("Surrender")
         onClicked: {
           if (isStarted && !getPhoto(Self.id).dead) {
-            const surrenderCheck = JSON.parse(Backend.callLuaFunction('CheckSurrenderAvailable', [miscStatus.playedTime]));
+            const surrenderCheck =
+              lcall('CheckSurrenderAvailable', miscStatus.playedTime);
             if (!surrenderCheck.length) {
-              surrenderDialog.informativeText = Backend.translate('Surrender is disabled in this mode');
+              surrenderDialog.informativeText =
+                luatr('Surrender is disabled in this mode');
             } else {
-              surrenderDialog.informativeText = surrenderCheck.map(str => `${Backend.translate(str.text)}（${str.passed ? '√' : '×'}）`).join('<br>');
+              surrenderDialog.informativeText = surrenderCheck
+                .map(str => `${luatr(str.text)}（${str.passed ? '√' : '×'}）`)
+                .join('<br>');
             }
             surrenderDialog.open();
           }
@@ -135,7 +139,7 @@ Item {
 
       MenuItem {
         id: volumeButton
-        text: Backend.translate("Audio Settings")
+        text: luatr("Audio Settings")
         onClicked: {
           volumeDialog.open();
         }
@@ -144,7 +148,7 @@ Item {
   }
 
   Button {
-    text: Backend.translate("Add Robot")
+    text: luatr("Add Robot")
     visible: isOwner && !isStarted && !isFull
     anchors.centerIn: parent
     enabled: config.serverEnableBot
@@ -153,7 +157,7 @@ Item {
     }
   }
   Button {
-    text: Backend.translate("Start Game")
+    text: luatr("Start Game")
     visible: isOwner && !isStarted && isFull
     enabled: isAllReady
     anchors.centerIn: parent
@@ -166,7 +170,7 @@ Item {
     interval: 1000
   }
   Button {
-    text: isReady ? Backend.translate("Cancel Ready") : Backend.translate("Ready")
+    text: isReady ? luatr("Cancel Ready") : luatr("Ready")
     visible: !isOwner && !isStarted
     enabled: !opTimer.running
     anchors.centerIn: parent
@@ -237,25 +241,25 @@ Item {
         width: parent.width
         wrapMode: TextEdit.WordWrap
         Component.onCompleted: {
-          const data = JSON.parse(Backend.callLuaFunction("GetRoomConfig", []));
-          let cardpack = JSON.parse(Backend.callLuaFunction("GetAllCardPack", []));
+          const data = lcall("GetRoomConfig");
+          let cardpack = lcall("GetAllCardPack");
           cardpack = cardpack.filter(p => !data.disabledPack.includes(p));
 
-          text = Backend.translate("GameMode") + Backend.translate(data.gameMode) + "<br />"
-            + Backend.translate("LuckCardNum") + "<b>" + data.luckTime + "</b><br />"
-            + Backend.translate("ResponseTime") + "<b>" + config.roomTimeout + "</b><br />"
-            + Backend.translate("GeneralBoxNum") + "<b>" + data.generalNum + "</b>"
-            + (data.enableFreeAssign ? "<br />" + Backend.translate("IncludeFreeAssign") : "")
-            + (data.enableDeputy ? " " + Backend.translate("IncludeDeputy") : "")
-            + '<br />' + Backend.translate('CardPackages') + cardpack.map(e => {
-              let ret = Backend.translate(e);
-              if (ret.search(/特殊牌|衍生牌/) === -1) { // TODO: 这种东西最好还是变量名规范化= =
+          text = luatr("GameMode") + luatr(data.gameMode) + "<br />"
+            + luatr("LuckCardNum") + "<b>" + data.luckTime + "</b><br />"
+            + luatr("ResponseTime") + "<b>" + config.roomTimeout + "</b><br />"
+            + luatr("GeneralBoxNum") + "<b>" + data.generalNum + "</b>"
+            + (data.enableFreeAssign ? "<br />" + luatr("IncludeFreeAssign")
+                                     : "")
+            + (data.enableDeputy ? " " + luatr("IncludeDeputy") : "")
+            + '<br />' + luatr('CardPackages') + cardpack.map(e => {
+              let ret = luatr(e);
+              // TODO: 这种东西最好还是变量名规范化= =
+              if (ret.search(/特殊牌|衍生牌/) === -1) {
                 ret = "<b>" + ret + "</b>";
               }
               return ret;
-            }).join('，')
-            //+ '<br /><b>禁包</b>：' + data.disabledPack.map(e => Backend.translate(e)).join('，')
-            //+ '<br /><b>禁将</b>：' + data.disabledGenerals.map(e => Backend.translate(e)).join('，')
+            }).join('，');
         }
       }
     }
@@ -436,13 +440,14 @@ Item {
     anchors.leftMargin: 8
     ColumnLayout {
       MetroButton {
-        text: Backend.translate("Choose one handcard")
+        text: luatr("Choose one handcard")
         textFont.pixelSize: 28
         visible: {
           if (dashboard.handcardArea.length <= 15) {
             return false;
           }
-          if (roomScene.state == "notactive" || roomScene.state == "replying") {
+          if (roomScene.state === "notactive"
+                  || roomScene.state === "replying") {
             return false;
           }
           return true;
@@ -450,21 +455,21 @@ Item {
         onClicked: roomScene.startCheat("../RoomElement/ChooseHandcard");
       }
       MetroButton {
-        text: Backend.translate("Revert Selection")
+        text: luatr("Revert Selection")
         textFont.pixelSize: 28
         enabled: dashboard.pending_skill !== ""
         onClicked: dashboard.revertSelection();
       }
       // MetroButton {
-      //   text: Backend.translate("Trust")
+      //   text: luatr("Trust")
       // }
       MetroButton {
-        text: Backend.translate("Sort Cards")
+        text: luatr("Sort Cards")
         textFont.pixelSize: 28
         onClicked: Logic.resortHandcards();
       }
       MetroButton {
-        text: Backend.translate("Chat")
+        text: luatr("Chat")
         textFont.pixelSize: 28
         onClicked: roomDrawer.open();
       }
@@ -479,21 +484,21 @@ Item {
 
     onCardSelected: function(card) {
       Logic.enableTargets(card);
-      if (typeof card === "number" && card !== -1 && roomScene.state === "playing"
-        && JSON.parse(Backend.callLuaFunction("GetPlayerHandcards", [Self.id])).includes(card)) {
+      if (typeof card === "number" && card !== -1
+        && roomScene.state === "playing"
+        && lcall("GetPlayerHandcards", Self.id).includes(card)) {
 
-        const skills = JSON.parse(Backend.callLuaFunction("GetCardSpecialSkills", [card]));
-        if (JSON.parse(Backend.callLuaFunction("CanUseCard", [card, Self.id, JSON.stringify(roomScene.extra_data)]))) {
+        const skills = lcall("GetCardSpecialSkills", card);
+        if (lcall("CanUseCard", card, Self.id,
+                  JSON.stringify(roomScene.extra_data))) {
           skills.unshift("_normal_use");
         }
         specialCardSkills.model = skills;
-        const skillName = Backend.callLuaFunction("GetCardSkill", [card]);
-        const prompt = JSON.parse(Backend.callLuaFunction(
-          "ActiveSkillPrompt",
-          [skillName, card, selected_targets]
-        ));
+        const skillName = lcall("GetCardSkill", card);
+        const prompt = lcall("ActiveSkillPrompt", skillName, card,
+                             selected_targets);
         if (prompt !== "") {
-          roomScene.setPrompt(processPrompt(prompt));
+          roomScene.setPrompt(Util.processPrompt(prompt));
         }
       } else {
         specialCardSkills.model = [];
@@ -524,18 +529,19 @@ Item {
           const totalMin = Math.floor(replayerDuration / 60);
           const totalSec = replayerDuration % 60;
 
-          return elapsedMin.toString() + ":" + elapsedSec + "/" + totalMin + ":" + totalSec;
+          return elapsedMin.toString() + ":" + elapsedSec + "/" + totalMin
+               + ":" + totalSec;
         }
       }
 
       Switch {
-        text: Backend.translate("Speed Resume")
+        text: luatr("Speed Resume")
         checked: false
         onCheckedChanged: Backend.controlReplayer("uniform");
       }
 
       Button {
-        text: Backend.translate("Speed Down")
+        text: luatr("Speed Down")
         onClicked: Backend.controlReplayer("slowdown");
       }
 
@@ -546,13 +552,13 @@ Item {
       }
 
       Button {
-        text: Backend.translate("Speed Up")
+        text: luatr("Speed Up")
         onClicked: Backend.controlReplayer("speedup");
       }
 
       Button {
         property bool running: true
-        text: Backend.translate(running ? "Pause" : "Resume")
+        text: luatr(running ? "Pause" : "Resume")
         onClicked: {
           running = !running;
           Backend.controlReplayer("toggle");
@@ -657,7 +663,7 @@ Item {
           id: specialCardSkills
           RadioButton {
             property string orig_text: modelData
-            text: Backend.translate(modelData)
+            text: luatr(modelData)
             checked: index === 0
             onCheckedChanged: {
               roomScene.resetPrompt();
@@ -665,23 +671,19 @@ Item {
               let prompt = ""
               if (modelData === "_normal_use") {
                 Logic.enableTargets(card);
-                const skillName = Backend.callLuaFunction("GetCardSkill", [card]);
-                prompt = JSON.parse(Backend.callLuaFunction(
-                  "ActiveSkillPrompt",
-                  [skillName, card, selected_targets]
-                ));
+                const skillName = lcall("GetCardSkill", card);
+                prompt = lcall("ActiveSkillPrompt", skillName, card,
+                               selected_targets);
               } else {
                 Logic.enableTargets(JSON.stringify({
                   skill: modelData,
                   subcards: [card],
                 }));
-                prompt = JSON.parse(Backend.callLuaFunction(
-                  "ActiveSkillPrompt",
-                  [modelData, card, selected_targets]
-                ));
+                prompt = lcall("ActiveSkillPrompt", modelData, card,
+                               selected_targets);
               }
               if (prompt !== "") {
-                roomScene.setPrompt(processPrompt(prompt));
+                roomScene.setPrompt(Util.processPrompt(prompt));
               }
             }
           }
@@ -707,8 +709,9 @@ Item {
 
       Button {
         id: skipNullificationButton
-        text: Backend.translate("SkipNullification")
-        visible: !!extra_data.useEventId && !skippedUseEventId.find(id => id === extra_data.useEventId)
+        text: luatr("SkipNullification")
+        visible: !!extra_data.useEventId
+                 && !skippedUseEventId.find(id => id === extra_data.useEventId)
         onClicked: {
           skippedUseEventId.push(extra_data.useEventId);
           Logic.doCancelButton();
@@ -717,20 +720,20 @@ Item {
 
       Button {
         id: okButton
-        text: Backend.translate("OK")
+        text: luatr("OK")
         onClicked: Logic.doOkButton();
       }
 
       Button {
         id: cancelButton
-        text: Backend.translate("Cancel")
+        text: luatr("Cancel")
         onClicked: Logic.doCancelButton();
       }
     }
 
     Button {
       id: endPhaseButton
-      text: Backend.translate("End")
+      text: luatr("End")
       anchors.bottom: parent.bottom
       anchors.bottomMargin: 40
       anchors.right: parent.right
@@ -793,12 +796,13 @@ Item {
 
   function activateSkill(skill_name, pressed) {
     if (pressed) {
-      const data = JSON.parse(Backend.callLuaFunction("GetInteractionOfSkill", [skill_name]));
+      const data = lcall("GetInteractionOfSkill", skill_name);
       if (data) {
-        Backend.callLuaFunction("SetInteractionDataOfSkill", [skill_name, "null"]);
+        lcall("SetInteractionDataOfSkill", skill_name, "null");
         switch (data.type) {
         case "combo":
-          skillInteraction.sourceComponent = Qt.createComponent("../SkillInteraction/SkillCombo.qml");
+          skillInteraction.sourceComponent =
+            Qt.createComponent("../SkillInteraction/SkillCombo.qml");
           skillInteraction.item.skill = skill_name;
           skillInteraction.item.default_choice = data["default"];
           skillInteraction.item.choices = data.choices;
@@ -807,7 +811,8 @@ Item {
           // skillInteraction.item.clicked();
           break;
         case "spin":
-          skillInteraction.sourceComponent = Qt.createComponent("../SkillInteraction/SkillSpin.qml");
+          skillInteraction.sourceComponent =
+            Qt.createComponent("../SkillInteraction/SkillSpin.qml");
           skillInteraction.item.skill = skill_name;
           skillInteraction.item.from = data.from;
           skillInteraction.item.to = data.to;
@@ -866,11 +871,11 @@ Item {
         width: roomDrawer.width
         TabButton {
           width: roomDrawer.width / 2
-          text: Backend.translate("Log")
+          text: luatr("Log")
         }
         TabButton {
           width: roomDrawer.width / 2
-          text: Backend.translate("Chat")
+          text: luatr("Chat")
         }
       }
     }
@@ -913,8 +918,8 @@ Item {
 
   MessageDialog {
     id: quitDialog
-    title: Backend.translate("Quit")
-    informativeText: Backend.translate("Are you sure to quit?")
+    title: luatr("Quit")
+    informativeText: luatr("Are you sure to quit?")
     buttons: MessageDialog.Ok | MessageDialog.Cancel
     onButtonClicked: function (button) {
       switch (button) {
@@ -931,14 +936,17 @@ Item {
 
   MessageDialog {
     id: surrenderDialog
-    title: Backend.translate("Surrender")
+    title: luatr("Surrender")
     informativeText: ''
     buttons: MessageDialog.Ok | MessageDialog.Cancel
     onButtonClicked: function (button, role) {
       switch (button) {
         case MessageDialog.Ok: {
-          const surrenderCheck = JSON.parse(Backend.callLuaFunction('CheckSurrenderAvailable', [miscStatus.playedTime]));
-          if (surrenderCheck.length && !surrenderCheck.find(check => !check.passed)) {
+          const surrenderCheck =
+            lcall('CheckSurrenderAvailable', miscStatus.playedTime);
+          if (surrenderCheck.length &&
+                !surrenderCheck.find(check => !check.passed)) {
+
             ClientInstance.notifyServer("PushRequest", [
               "surrender", true
             ]);
@@ -977,7 +985,7 @@ Item {
   GlowText {
     anchors.centerIn: dashboard
     visible: Logic.getPhoto(Self.id).rest > 0 && !config.observing
-    text: Backend.translate("Resting, don't leave!")
+    text: luatr("Resting, don't leave!")
     color: "#DBCC69"
     font.family: fontLibian.name
     font.pixelSize: 28
@@ -991,7 +999,7 @@ Item {
     color: "transparent"
     GlowText {
       anchors.centerIn: parent
-      text: Backend.translate("Observing ...")
+      text: luatr("Observing ...")
       color: "#4B83CD"
       font.family: fontLi2.name
       font.pixelSize: 48
@@ -1096,20 +1104,9 @@ Item {
     onActivated: Logic.doCancelButton();
   }
 
-  function processPrompt(prompt) {
-    const data = prompt.split(":");
-    let raw = Backend.translate(data[0]);
-    const src = parseInt(data[1]);
-    const dest = parseInt(data[2]);
-    if (raw.match("%src")) raw = raw.replace(/%src/g, Backend.translate(getPhoto(src).general));
-    if (raw.match("%dest")) raw = raw.replace(/%dest/g, Backend.translate(getPhoto(dest).general));
-    if (raw.match("%arg2")) raw = raw.replace(/%arg2/g, Backend.translate(data[4]));
-    if (raw.match("%arg")) raw = raw.replace(/%arg/g, Backend.translate(data[3]));
-    return raw;
-  }
-
   function getCurrentCardUseMethod() {
-    if (specialCardSkills.count === 1 && specialCardSkills.model[0] !== "_normal_use") {
+    if (specialCardSkills.count === 1
+            && specialCardSkills.model[0] !== "_normal_use") {
       return specialCardSkills.model[0];
     }
 
@@ -1125,8 +1122,10 @@ Item {
   function addToChat(pid, raw, msg) {
     if (raw.type === 1) return;
 
-    msg = msg.replace(/\{emoji([0-9]+)\}/g, '<img src="../../image/emoji/$1.png" height="24" width="24" />');
-    raw.msg = raw.msg.replace(/\{emoji([0-9]+)\}/g, '<img src="../../image/emoji/$1.png" height="24" width="24" />');
+    msg = msg.replace(/\{emoji([0-9]+)\}/g,
+      '<img src="../../image/emoji/$1.png" height="24" width="24" />');
+    raw.msg = raw.msg.replace(/\{emoji([0-9]+)\}/g,
+      '<img src="../../image/emoji/$1.png" height="24" width="24" />');
 
     if (raw.msg.startsWith("$")) {
       if (specialChat(pid, raw, raw.msg.slice(1))) return;
@@ -1149,7 +1148,7 @@ Item {
 
     const time = data.time;
     const userName = data.userName;
-    const general = Backend.translate(data.general);
+    const general = luatr(data.general);
 
     if (msg.startsWith("!")) {
       const splited = msg.split(":");
@@ -1167,10 +1166,15 @@ Item {
           //  return false;
 
           const fromItem = Logic.getPhotoOrDashboard(fromId);
-          const fromPos = mapFromItem(fromItem, fromItem.width / 2, fromItem.height / 2);
+          const fromPos = mapFromItem(fromItem, fromItem.width / 2,
+                                      fromItem.height / 2);
           const toItem = Logic.getPhoto(toId);
-          const toPos = mapFromItem(toItem, toItem.width / 2, toItem.height / 2);
-          const egg = component.createObject(roomScene, { start: fromPos, end: toPos });
+          const toPos = mapFromItem(toItem, toItem.width / 2,
+                                    toItem.height / 2);
+          const egg = component.createObject(roomScene, {
+                                                 start: fromPos,
+                                                 end: toPos
+                                             });
           egg.finished.connect(() => egg.destroy());
           egg.running = true;
 
@@ -1181,11 +1185,11 @@ Item {
       }
     } else if (msg.startsWith("~")) {
       const g = msg.slice(1);
-      const extension = JSON.parse(Backend.callLuaFunction("GetGeneralData", [g])).extension;
+      const extension = lcall("GetGeneralData", g).extension;
       if (!config.disableMsgAudio)
         Backend.playSound("./packages/" + extension + "/audio/death/" + g);
 
-      const m = Backend.translate("~" + g);
+      const m = luatr("~" + g);
       data.msg = m;
       if (general === "")
         chat.append(`[${time}] ${userName}: ${m}`, data);
@@ -1215,7 +1219,8 @@ Item {
           i: idx,
         }));
       } catch (e) {}
-      const m = Backend.translate("$" + skill + (gene ? "_" + gene : "") + (idx ? idx.toString() : ""));
+      const m = luatr("$" + skill + (gene ? "_" + gene : "")
+                          + (idx ? idx.toString() : ""));
       data.msg = m;
       if (general === "")
         chat.append(`[${time}] ${userName}: ${m}`, data);
@@ -1253,8 +1258,7 @@ Item {
     for (let i = 0; i < photoModel.count; i++) {
       const item = photos.itemAt(i);
       if (show) {
-        const dis = Backend.callLuaFunction("DistanceTo",[Self.id, item.playerid]);
-        item.distance = parseInt(dis);
+        item.distance = lcall("DistanceTo", Self.id, item.playerid);
       } else {
         item.distance = -1;
       }
@@ -1273,7 +1277,7 @@ Item {
       const item = photoModel.get(i);
       let gameData;
       try {
-        gameData = JSON.parse(Backend.callLuaFunction("GetPlayerGameData", [item.id]));
+        gameData = lcall("GetPlayerGameData", item.id);
       } catch (e) {
         console.log(e);
         gameData = [0, 0, 0, 0];
@@ -1290,7 +1294,7 @@ Item {
       }
     }
     mainStack.pop();
-    Backend.callLuaFunction("ResetClientLua", []);
+    lcall("ResetClientLua");
     mainStack.push(room);
     mainStack.currentItem.loadPlayerData(datalist);
   }
@@ -1306,12 +1310,13 @@ Item {
 
   function loadPlayerData(datalist) {
     datalist.forEach(d => {
-      if (d.id == Self.id) {
+      if (d.id === Self.id) {
         roomScene.isOwner = d.isOwner;
       } else {
-        Backend.callLuaFunction("ResetAddPlayer", [JSON.stringify([d.id, d.name, d.avatar, d.ready, d.gameData[3]])]);
+        lcall("ResetAddPlayer",
+          JSON.stringify([d.id, d.name, d.avatar, d.ready, d.gameData[3]]));
       }
-      Backend.callLuaFunction("SetPlayerGameData", [d.id, d.gameData]);
+      lcall("SetPlayerGameData", d.id, d.gameData);
       Logic.getPhotoModel(d.id).isOwner = d.isOwner;
     });
   }
@@ -1321,7 +1326,7 @@ Item {
   }
 
   Component.onCompleted: {
-    toast.show(Backend.translate("$EnterRoom"));
+    toast.show(luatr("$EnterRoom"));
     playerNum = config.roomCapacity;
 
     for (let i = 0; i < playerNum; i++) {
diff --git a/Fk/Pages/RoomLogic.js b/Fk/Pages/RoomLogic.js
index faa991df..8d3eca11 100644
--- a/Fk/Pages/RoomLogic.js
+++ b/Fk/Pages/RoomLogic.js
@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
+.import Fk.Util as Util
+
 const Card = {
   Unknown : 0,
   PlayerHand : 1,
@@ -28,11 +30,13 @@ function arrangeManyPhotos() {
   const roomAreaPadding = -16;
 
   let horizontalSpacing = 8;
-  let photoWidth = (roomArea.width - horizontalSpacing * playerNum) / (playerNum - 1);
+  let photoWidth = (roomArea.width - horizontalSpacing * playerNum)
+                 / (playerNum - 1);
   let photoScale = 0.75;
   if (photoWidth > photoMaxWidth) {
     photoWidth = photoMaxWidth;
-    horizontalSpacing = (roomArea.width - photoWidth * (playerNum - 1)) / playerNum;
+    horizontalSpacing = (roomArea.width - photoWidth * (playerNum - 1))
+                      / playerNum;
   } else {
     photoScale = photoWidth / photoBaseWidth;
   }
@@ -134,14 +138,13 @@ function arrangePhotos() {
 
 function doOkButton() {
   if (roomScene.state === "playing" || roomScene.state === "responding") {
-    const reply = JSON.stringify(
-      {
-        card: dashboard.getSelectedCard(),
-        targets: selected_targets,
-        special_skill: roomScene.getCurrentCardUseMethod(),
-        interaction_data: roomScene.skillInteraction.item ? roomScene.skillInteraction.item.answer : undefined,
-      }
-    );
+    const reply = JSON.stringify({
+      card: dashboard.getSelectedCard(),
+      targets: selected_targets,
+      special_skill: roomScene.getCurrentCardUseMethod(),
+      interaction_data: roomScene.skillInteraction.item ?
+                        roomScene.skillInteraction.item.answer : undefined,
+    });
     replyToServer(reply);
     return;
   }
@@ -244,7 +247,8 @@ function getPhotoOrDashboard(id) {
 function getAreaItem(area, id) {
   if (area === Card.DrawPile) {
     return drawPile;
-  } else if (area === Card.DiscardPile || area === Card.Processing || area === Card.Void) {
+  } else if (area === Card.DiscardPile || area === Card.Processing ||
+             area === Card.Void) {
     return tablePile;
   } else if (area === Card.AG) {
     return popupBox.item;
@@ -372,7 +376,8 @@ function setEmotion(id, emotion, isCardId) {
     }
   }
 
-  const animation = component.createObject(photo, {source: (OS === "Win" ? "file:///" : "") + path});
+  const animation = component.createObject(photo,
+                    { source: (OS === "Win" ? "file:///" : "") + path });
   animation.anchors.centerIn = photo;
   if (isCardId) {
     animation.started.connect(() => photo.busy = true);
@@ -452,7 +457,8 @@ function doIndicate(from, tos) {
     return;
 
   const fromItem = getPhotoOrDashboard(from);
-  const fromPos = mapFromItem(fromItem, fromItem.width / 2, fromItem.height / 2);
+  const fromPos = mapFromItem(fromItem, fromItem.width / 2,
+                              fromItem.height / 2);
 
   const end = [];
   for (let i = 0; i < tos.length; i++) {
@@ -464,7 +470,11 @@ function doIndicate(from, tos) {
   }
 
   const color = "#96943D";
-  const line = component.createObject(roomScene, {start: fromPos, end: end, color: color});
+  const line = component.createObject(roomScene, {
+                                        start: fromPos,
+                                        end: end,
+                                        color: color
+                                      });
   line.finished.connect(() => line.destroy());
   line.running = true;
 }
@@ -480,7 +490,7 @@ callbacks["MaxCard"] = (jsonData) => {
 }
 
 function changeSelf(id) {
-  Backend.callLuaFunction("ChangeSelf", [id]);
+  lcall("ChangeSelf", id);
 
   // move new selfPhoto to dashboard
   let order = new Array(photoModel.count);
@@ -533,15 +543,15 @@ callbacks["AddPlayer"] = (jsonData) => {
   }
 }
 
-function enableTargets(card) { // card: int | { skill: string, subcards: int[] }
+// card: int | { skill: string, subcards: int[] }
+function enableTargets(card) {
   if (roomScene.respond_play) {
-    const candidate = (!isNaN(card) && card !== -1) || typeof(card) === "string";
+    const candidate = (!isNaN(card) && card !== -1)
+                    || typeof(card) === "string";
     if (candidate) {
-      okButton.enabled = JSON.parse(Backend.callLuaFunction(
-        "CardFitPattern",
-        [card, roomScene.responding_card]
-      )) && !JSON.parse(Backend.callLuaFunction(
-        "CardProhibitedResponse", [card]));
+      okButton.enabled =
+        lcall("CardFitPattern", card, roomScene.responding_card) &&
+        !lcall("CardProhibitedResponse", card);
     } else {
       okButton.enabled = false;
     }
@@ -568,10 +578,8 @@ function enableTargets(card) { // card: int | { skill: string, subcards: int[] }
     all_photos.forEach(photo => {
       photo.state = "candidate";
       const id = photo.playerid;
-      const ret = JSON.parse(Backend.callLuaFunction(
-        "CanUseCardToTarget",
-        [card, id, selected_targets, JSON.stringify(roomScene.extra_data)]
-      ));
+      const ret = lcall("CanUseCardToTarget", card, id, selected_targets,
+                        JSON.stringify(roomScene.extra_data));
       photo.selectable = ret;
       if (roomScene.extra_data instanceof Object) {
         const must = roomScene.extra_data.must_targets;
@@ -588,22 +596,20 @@ function enableTargets(card) { // card: int | { skill: string, subcards: int[] }
         if (included instanceof Array) {
           if (included.filter((val) => {
             return selected_targets.indexOf(val) !== -1;
-          }).length === 0 && included.indexOf(id) === -1) photo.selectable = false;
+          }).length === 0 && included.indexOf(id) === -1)
+                                   photo.selectable = false;
         }
       }
     })
 
-    okButton.enabled = JSON.parse(Backend.callLuaFunction(
-      "CardFeasible", [card, selected_targets]
-    ));
+    okButton.enabled = lcall("CardFeasible", card, selected_targets);
     if (okButton.enabled && roomScene.state === "responding") {
-      okButton.enabled = JSON.parse(Backend.callLuaFunction(
-        "CardFitPattern",
-        [card, roomScene.responding_card]
-      )) && (roomScene.autoPending || !JSON.parse(Backend.callLuaFunction(
-        "CardProhibitedUse", [card])));
+      okButton.enabled =
+        lcall("CardFitPattern", card, roomScene.responding_card) &&
+        (roomScene.autoPending || !lcall("CardProhibitedUse", card));
     } else if (okButton.enabled && roomScene.state === "playing") {
-      okButton.enabled = JSON.parse(Backend.callLuaFunction("CanUseCard", [card, Self.id, JSON.stringify(roomScene.extra_data)]));
+      okButton.enabled = lcall("CanUseCard", card, Self.id,
+                               JSON.stringify(roomScene.extra_data));
     }
     if (okButton.enabled) {
       if (roomScene.extra_data instanceof Object) {
@@ -646,10 +652,8 @@ function updateSelectedTargets(playerid, selected) {
     all_photos.forEach(photo => {
       if (photo.selected) return;
       const id = photo.playerid;
-      const ret = JSON.parse(Backend.callLuaFunction(
-        "CanUseCardToTarget",
-        [card, id, selected_targets, JSON.stringify(roomScene.extra_data)]
-      ));
+      const ret = lcall("CanUseCardToTarget", card, id, selected_targets,
+                         JSON.stringify(roomScene.extra_data));
       photo.selectable = ret;
       if (roomScene.extra_data instanceof Object) {
         const must = roomScene.extra_data.must_targets;
@@ -666,22 +670,20 @@ function updateSelectedTargets(playerid, selected) {
         if (included instanceof Array) {
           if (included.filter((val) => {
             return selected_targets.indexOf(val) !== -1;
-          }).length === 0 && included.indexOf(id) === -1) photo.selectable = false;
+          }).length === 0 && included.indexOf(id) === -1)
+                                   photo.selectable = false;
         }
       }
     })
 
-    okButton.enabled = JSON.parse(Backend.callLuaFunction(
-      "CardFeasible", [card, selected_targets]
-    ));
+    okButton.enabled = lcall("CardFeasible", card, selected_targets);
     if (okButton.enabled && roomScene.state === "responding") {
-      okButton.enabled = JSON.parse(Backend.callLuaFunction(
-        "CardFitPattern",
-        [card, roomScene.responding_card]
-      )) && (roomScene.autoPending || !JSON.parse(Backend.callLuaFunction(
-        "CardProhibitedUse", [card])));
+      okButton.enabled =
+        lcall("CardFitPattern", card, roomScene.responding_card) &&
+        (roomScene.autoPending || !lcall("CardProhibitedUse", card));
     } else if (okButton.enabled && roomScene.state === "playing") {
-      okButton.enabled = JSON.parse(Backend.callLuaFunction("CanUseCard", [card, Self.id, JSON.stringify(roomScene.extra_data)]));
+      okButton.enabled = lcall("CanUseCard", card, Self.id,
+                               JSON.stringify(roomScene.extra_data));
     }
     if (okButton.enabled) {
       if (roomScene.extra_data instanceof Object) {
@@ -819,8 +821,7 @@ callbacks["UpdateCard"] = (j) => {
     return;
   }
 
-  const data = JSON.parse(Backend.callLuaFunction("GetCardData", [id]));
-  card.setData(data);
+  card.setData(lcall("GetCardData", id));
 }
 
 callbacks["StartGame"] = (jsonData) => {
@@ -878,8 +879,8 @@ callbacks["MoveFocus"] = (jsonData) => {
     if (focuses.indexOf(model.id) != -1) {
       item = photos.itemAt(i);
       item.progressBar.visible = true;
-      item.progressTip = Backend.translate(command)
-        + Backend.translate(" thinking...");
+      item.progressTip = luatr(command)
+        + luatr(" thinking...");
 
       /*
       if (command === "PlayCard") {
@@ -914,9 +915,10 @@ callbacks["AskForGeneral"] = (jsonData) => {
   const n = data[1];
   const convert = data[2];
   const heg = data[3];
-  roomScene.setPrompt(Backend.translate("#AskForGeneral"), true);
+  roomScene.setPrompt(luatr("#AskForGeneral"), true);
   roomScene.state = "replying";
-  roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/ChooseGeneralBox.qml");
+  roomScene.popupBox.sourceComponent =
+    Qt.createComponent("../RoomElement/ChooseGeneralBox.qml");
   const box = roomScene.popupBox.item;
   box.accepted.connect(() => {
     replyToServer(JSON.stringify(box.choices));
@@ -934,8 +936,8 @@ callbacks["AskForSkillInvoke"] = (jsonData) => {
   const data = JSON.parse(jsonData);
   const skill = data[0];
   const prompt = data[1];
-  roomScene.promptText = prompt ? processPrompt(prompt) : Backend.translate("#AskForSkillInvoke")
-    .arg(Backend.translate(skill));
+  roomScene.promptText = prompt ? Util.processPrompt(prompt)
+                              : luatr("#AskForSkillInvoke").arg(luatr(skill));
   roomScene.state = "replying";
   roomScene.okCancel.visible = true;
   roomScene.okButton.enabled = true;
@@ -953,26 +955,24 @@ callbacks["AskForGuanxing"] = (jsonData) => {
   const bottom_area_name = data.bottom_area_name;
   const prompt = data.prompt;
   roomScene.state = "replying";
-  roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/GuanxingBox.qml");
-  data.cards.forEach(id => {
-    const d = Backend.callLuaFunction("GetCardData", [id]);
-    cards.push(JSON.parse(d));
-  });
+  roomScene.popupBox.sourceComponent =
+    Qt.createComponent("../RoomElement/GuanxingBox.qml");
+  data.cards.forEach(id => cards.push(lcall("GetCardData", id)));
   const box = roomScene.popupBox.item;
   box.prompt = prompt;
   if (max_top_cards === 0) {
     box.areaCapacities = [max_bottom_cards];
     box.areaLimits = [min_bottom_cards];
-    box.areaNames = [Backend.translate(bottom_area_name)];
+    box.areaNames = [luatr(bottom_area_name)];
   } else {
     if (max_bottom_cards === 0) {
       box.areaCapacities = [max_top_cards];
       box.areaLimits = [min_top_cards];
-      box.areaNames = [Backend.translate(top_area_name)];
+      box.areaNames = [luatr(top_area_name)];
     } else {
       box.areaCapacities = [max_top_cards, max_bottom_cards];
       box.areaLimits = [min_top_cards, min_bottom_cards];
-      box.areaNames = [Backend.translate(top_area_name), Backend.translate(bottom_area_name)];
+      box.areaNames = [luatr(top_area_name), luatr(bottom_area_name)];
     }
   }
   box.cards = cards;
@@ -989,18 +989,16 @@ callbacks["AskForExchange"] = (jsonData) => {
   const capacities = [];
   const limits = [];
   roomScene.state = "replying";
-  roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/GuanxingBox.qml");
+  roomScene.popupBox.sourceComponent =
+    Qt.createComponent("../RoomElement/GuanxingBox.qml");
   let for_i = 0;
   const box = roomScene.popupBox.item;
   data.piles.forEach(ids => {
     if (ids.length > 0) {
-      ids.forEach(id => {
-        const d = Backend.callLuaFunction("GetCardData", [id]);
-        cards.push(JSON.parse(d));
-      });
+      ids.forEach(id => cards.push(lcall("GetCardData", id)));
       capacities.push(ids.length);
       limits.push(0);
-      cards_name.push(Backend.translate(data.piles_name[for_i]));
+      cards_name.push(luatr(data.piles_name[for_i]));
       for_i ++;
     }
   });
@@ -1024,10 +1022,10 @@ callbacks["AskForChoice"] = (jsonData) => {
   const prompt = data[3];
   const detailed = data[4];
   if (prompt === "") {
-    roomScene.promptText = Backend.translate("#AskForChoice")
-      .arg(Backend.translate(skill_name));
+    roomScene.promptText = luatr("#AskForChoice")
+      .arg(luatr(skill_name));
   } else {
-    roomScene.setPrompt(processPrompt(prompt), true);
+    roomScene.setPrompt(Util.processPrompt(prompt), true);
   }
   roomScene.state = "replying";
   let qmlSrc;
@@ -1059,10 +1057,10 @@ callbacks["AskForChoices"] = (jsonData) => {
   const prompt = data[5];
   const detailed = data[6];
   if (prompt === "") {
-    roomScene.promptText = Backend.translate("#AskForChoices")
-      .arg(Backend.translate(skill_name));
+    roomScene.promptText = luatr("#AskForChoices")
+      .arg(luatr(skill_name));
   } else {
-    roomScene.setPrompt(processPrompt(prompt), true);
+    roomScene.setPrompt(Util.processPrompt(prompt), true);
   }
   roomScene.state = "replying";
   let qmlSrc;
@@ -1095,13 +1093,14 @@ callbacks["AskForCardChosen"] = (jsonData) => {
   const reason = data._reason;
   const prompt = data._prompt;
   if (prompt === "") {
-    roomScene.promptText = Backend.translate("#AskForChooseCard")
-      .arg(Backend.translate(reason));
+    roomScene.promptText = luatr("#AskForChooseCard")
+      .arg(luatr(reason));
   } else {
-    roomScene.setPrompt(processPrompt(prompt), true);
+    roomScene.setPrompt(Util.processPrompt(prompt), true);
   }
   roomScene.state = "replying";
-  roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/PlayerCardBox.qml");
+  roomScene.popupBox.sourceComponent =
+    Qt.createComponent("../RoomElement/PlayerCardBox.qml");
 
   const box = roomScene.popupBox.item;
   box.prompt = prompt;
@@ -1109,17 +1108,12 @@ callbacks["AskForCardChosen"] = (jsonData) => {
     const arr = [];
     const ids = d[1];
 
-    ids.forEach(id => {
-      const card_data = JSON.parse(Backend.callLuaFunction("GetCardData", [id]));
-      arr.push(card_data);
-    });
+    ids.forEach(id => arr.push(lcall("GetCardData", id)));
     box.addCustomCards(d[0], arr);
   }
 
   roomScene.popupBox.moveToCenter();
-  box.cardSelected.connect(function(cid){
-    replyToServer(cid);
-  });
+  box.cardSelected.connect(cid => replyToServer(cid));
 }
 
 callbacks["AskForCardsChosen"] = (jsonData) => {
@@ -1131,14 +1125,15 @@ callbacks["AskForCardsChosen"] = (jsonData) => {
   const reason = data._reason;
   const prompt = data._prompt;
   if (prompt === "") {
-    roomScene.promptText = Backend.translate("#AskForChooseCards")
-    .arg(Backend.translate(reason)).arg(min).arg(max);
+    roomScene.promptText = luatr("#AskForChooseCards")
+    .arg(luatr(reason)).arg(min).arg(max);
   } else {
-    roomScene.setPrompt(processPrompt(prompt), true);
+    roomScene.setPrompt(Util.processPrompt(prompt), true);
   }
 
   roomScene.state = "replying";
-  roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/PlayerCardBox.qml");
+  roomScene.popupBox.sourceComponent =
+    Qt.createComponent("../RoomElement/PlayerCardBox.qml");
   const box = roomScene.popupBox.item;
   box.multiChoose = true;
   box.min = min;
@@ -1148,10 +1143,7 @@ callbacks["AskForCardsChosen"] = (jsonData) => {
     const arr = [];
     const ids = d[1];
 
-    ids.forEach(id => {
-      const card_data = JSON.parse(Backend.callLuaFunction("GetCardData", [id]));
-      arr.push(card_data);
-    });
+    ids.forEach(id => arr.push(lcall("GetCardData", id)));
     box.addCustomCards(d[0], arr);
   }
 
@@ -1165,7 +1157,8 @@ callbacks["AskForPoxi"] = (jsonData) => {
   const { type, data, extra_data, cancelable } = JSON.parse(jsonData);
 
   roomScene.state = "replying";
-  roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/PoxiBox.qml");
+  roomScene.popupBox.sourceComponent =
+    Qt.createComponent("../RoomElement/PoxiBox.qml");
   const box = roomScene.popupBox.item;
   box.poxi_type = type;
   box.card_data = data;
@@ -1175,10 +1168,7 @@ callbacks["AskForPoxi"] = (jsonData) => {
     const arr = [];
     const ids = d[1];
 
-    ids.forEach(id => {
-      const card_data = JSON.parse(Backend.callLuaFunction("GetCardData", [id]));
-      arr.push(card_data);
-    });
+    ids.forEach(id => arr.push(lcall("GetCardData", id)));
     box.addCustomCards(d[0], arr);
   }
 
@@ -1193,13 +1183,14 @@ callbacks["AskForMoveCardInBoard"] = (jsonData) => {
   const { cards, cardsPosition, generalNames, playerIds } = data;
 
   roomScene.state = "replying";
-  roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/MoveCardInBoardBox.qml");
+  roomScene.popupBox.sourceComponent =
+    Qt.createComponent("../RoomElement/MoveCardInBoardBox.qml");
 
   const boxCards = [];
   cards.forEach(id => {
     const cardPos = cardsPosition[cards.findIndex(cid => cid === id)];
-    const d = Backend.callLuaFunction("GetCardData", [id, playerIds[cardPos]]);
-    boxCards.push(JSON.parse(d));
+    const d = lcall("GetCardData", id, playerIds[cardPos]);
+    boxCards.push(d);
   });
 
   const box = roomScene.popupBox.item;
@@ -1208,7 +1199,10 @@ callbacks["AskForMoveCardInBoard"] = (jsonData) => {
   box.playerIds = playerIds;
   box.generalNames = generalNames.map(name => {
     const namesSplited = name.split('/');
-    return namesSplited.length > 1 ? namesSplited.map(nameSplited => Backend.translate(nameSplited)).join('/') : Backend.translate(name)
+    if (namesSplited.length > 1) {
+      return namesSplited.map(nameSplited => luatr(nameSplited)).join('/');
+    }
+    return luatr(name);
   });
 
   box.arrangeCards();
@@ -1227,7 +1221,7 @@ callbacks["PlayCard"] = (jsonData) => {
   // jsonData: int playerId
   const playerId = parseInt(jsonData);
   if (playerId === Self.id) {
-    roomScene.setPrompt(Backend.translate("#PlayCard"), true);
+    roomScene.setPrompt(luatr("#PlayCard"), true);
     roomScene.state = "playing";
     okButton.enabled = false;
   }
@@ -1263,19 +1257,6 @@ callbacks["PrelightSkill"] = (jsonData) => {
   dashboard.prelightSkill(skill_name, prelight);
 }
 
-// prompt: 'string:<src>:<dest>:<arg>:<arg2>'
-function processPrompt(prompt) {
-  const data = prompt.split(":");
-  let raw = Backend.translate(data[0]);
-  const src = parseInt(data[1]);
-  const dest = parseInt(data[2]);
-  if (raw.match("%src")) raw = raw.replace(/%src/g, Backend.translate(getPhoto(src).general));
-  if (raw.match("%dest")) raw = raw.replace(/%dest/g, Backend.translate(getPhoto(dest).general));
-  if (raw.match("%arg2")) raw = raw.replace(/%arg2/g, Backend.translate(data[4]));
-  if (raw.match("%arg")) raw = raw.replace(/%arg/g, Backend.translate(data[3]));
-  return raw;
-}
-
 callbacks["AskForUseActiveSkill"] = (jsonData) => {
   // jsonData: string skill_name, string prompt
   const data = JSON.parse(jsonData);
@@ -1284,16 +1265,16 @@ callbacks["AskForUseActiveSkill"] = (jsonData) => {
   const cancelable = data[2];
   const extra_data = data[3] ?? {};
   if (prompt === "") {
-    roomScene.promptText = Backend.translate("#AskForUseActiveSkill")
-      .arg(Backend.translate(skill_name));
+    roomScene.promptText = luatr("#AskForUseActiveSkill")
+      .arg(luatr(skill_name));
   } else {
-    roomScene.setPrompt(processPrompt(prompt), true);
+    roomScene.setPrompt(Util.processPrompt(prompt), true);
   }
 
   roomScene.respond_play = false;
   roomScene.state = "responding";
 
-  if (JSON.parse(Backend.callLuaFunction('GetSkillData', [skill_name])).isViewAsSkill) {
+  if (lcall('GetSkillData', skill_name).isViewAsSkill) {
     roomScene.responding_card = ".";
   }
 
@@ -1321,7 +1302,8 @@ callbacks["AskForUseCard"] = (jsonData) => {
   const extra_data = data[4];
   const disabledSkillNames = data[5];
   if (extra_data != null) {
-    if (extra_data.effectTo !== Self.id && roomScene.skippedUseEventId.find(id => id === extra_data.useEventId)) {
+    if (extra_data.effectTo !== Self.id &&
+        roomScene.skippedUseEventId.find(id => id === extra_data.useEventId)) {
       doCancelButton();
       return;
     } else {
@@ -1330,10 +1312,10 @@ callbacks["AskForUseCard"] = (jsonData) => {
   }
 
   if (prompt === "") {
-    roomScene.promptText = Backend.translate("#AskForUseCard")
-      .arg(Backend.translate(cardname));
+    roomScene.promptText = luatr("#AskForUseCard")
+      .arg(luatr(cardname));
   } else {
-    roomScene.setPrompt(processPrompt(prompt), true);
+    roomScene.setPrompt(Util.processPrompt(prompt), true);
   }
   roomScene.responding_card = pattern;
   roomScene.respond_play = false;
@@ -1352,10 +1334,10 @@ callbacks["AskForResponseCard"] = (jsonData) => {
   const disabledSkillNames = data[5];
 
   if (prompt === "") {
-    roomScene.promptText = Backend.translate("#AskForResponseCard")
-      .arg(Backend.translate(cardname));
+    roomScene.promptText = luatr("#AskForResponseCard")
+      .arg(luatr(cardname));
   } else {
-    roomScene.setPrompt(processPrompt(prompt), true);
+    roomScene.setPrompt(Util.processPrompt(prompt), true);
   }
   roomScene.responding_card = pattern;
   roomScene.respond_play = true;
@@ -1422,7 +1404,8 @@ callbacks["Animate"] = (jsonData) => {
     }
     case "InvokeSkill": {
       const id = data.player;
-      const component = Qt.createComponent("../RoomElement/SkillInvokeAnimation.qml");
+      const component =
+            Qt.createComponent("../RoomElement/SkillInvokeAnimation.qml");
       if (component.status !== Component.Ready)
         return;
 
@@ -1432,7 +1415,7 @@ callbacks["Animate"] = (jsonData) => {
       }
 
       const animation = component.createObject(photo, {
-        skill_name: Backend.translate(data.name),
+        skill_name: luatr(data.name),
         skill_type: (data.skill_type ? data.skill_type : "special"),
       });
       animation.anchors.centerIn = photo;
@@ -1467,7 +1450,8 @@ callbacks["LogEvent"] = (jsonData) => {
       setEmotion(data.to, "damage");
       item.tremble();
       data.damageType = data.damageType || "normal_damage";
-      Backend.playSound("./audio/system/" + data.damageType + (data.damageNum > 1 ? "2" : ""));
+      Backend.playSound("./audio/system/" + data.damageType +
+                        (data.damageNum > 1 ? "2" : ""));
       break;
     }
     case "LoseHP": {
@@ -1489,9 +1473,10 @@ callbacks["LogEvent"] = (jsonData) => {
 
       // try main general
       if (data.general) {
-        dat = JSON.parse(Backend.callLuaFunction("GetGeneralData", [data.general]));
+        dat = lcall("GetGeneralData", data.general);
         extension = dat.extension;
-        path = "./packages/" + extension + "/audio/skill/" + skill + "_" + data.general;
+        path = "./packages/" + extension + "/audio/skill/" + skill + "_"
+                + data.general;
         if (Backend.exists(path + ".mp3") || Backend.exists(path + "1.mp3")) {
           Backend.playSound(path, data.i);
           break;
@@ -1500,9 +1485,10 @@ callbacks["LogEvent"] = (jsonData) => {
 
       // secondly try deputy general
       if (data.deputy) {
-        dat = JSON.parse(Backend.callLuaFunction("GetGeneralData", [data.deputy]));
+        dat = lcall("GetGeneralData", data.deputy);
         extension = dat.extension;
-        path = "./packages/" + extension + "/audio/skill/" + skill + "_" + data.deputy;
+        path = "./packages/" + extension + "/audio/skill/" + skill + "_"
+                + data.deputy;
         if (Backend.exists(path + ".mp3") || Backend.exists(path + "1.mp3")) {
           Backend.playSound(path, data.i);
           break;
@@ -1510,7 +1496,7 @@ callbacks["LogEvent"] = (jsonData) => {
       }
 
       // finally normal skill
-      dat = JSON.parse(Backend.callLuaFunction("GetSkillData", [skill]));
+      dat = lcall("GetSkillData", skill);
       extension = dat.extension;
       path = "./packages/" + extension + "/audio/skill/" + skill;
       Backend.playSound(path, data.i);
@@ -1522,8 +1508,10 @@ callbacks["LogEvent"] = (jsonData) => {
     }
     case "Death": {
       const item = getPhoto(data.to);
-      const extension = JSON.parse(Backend.callLuaFunction("GetGeneralData", [item.general])).extension;
-      Backend.playSound("./packages/" + extension + "/audio/death/" + item.general);
+      const extension = lcall("GetGeneralData", item.general).extension;
+      Backend.playSound("./packages/" + extension + "/audio/death/"
+                        + item.general);
+      break;
     }
     default:
       break;
@@ -1532,7 +1520,8 @@ callbacks["LogEvent"] = (jsonData) => {
 
 callbacks["GameOver"] = (jsonData) => {
   roomScene.state = "notactive";
-  roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/GameOverBox.qml");
+  roomScene.popupBox.sourceComponent =
+    Qt.createComponent("../RoomElement/GameOverBox.qml");
   const box = roomScene.popupBox.item;
   box.winner = jsonData;
   // roomScene.isStarted = false;
@@ -1541,7 +1530,8 @@ callbacks["GameOver"] = (jsonData) => {
 callbacks["FillAG"] = (j) => {
   const data = JSON.parse(j);
   const ids = data[0];
-  roomScene.manualBox.sourceComponent = Qt.createComponent("../RoomElement/AG.qml");
+  roomScene.manualBox.sourceComponent =
+    Qt.createComponent("../RoomElement/AG.qml");
   roomScene.manualBox.item.addIds(ids);
 }
 
@@ -1556,7 +1546,7 @@ callbacks["TakeAG"] = (j) => {
   const pid = data[0];
   const cid = data[1];
   const item = getPhoto(pid);
-  const general = Backend.translate(item.general);
+  const general = luatr(item.general);
 
   // the item should be AG box
   roomScene.manualBox.item.takeAG(general, cid);
@@ -1579,7 +1569,7 @@ callbacks["MiniGame"] = (j) => {
   const data = JSON.parse(j);
   const game = data.type;
   const dat = data.data;
-  const gdata = JSON.parse(Backend.callLuaFunction("GetMiniGame", [game, Self.id, JSON.stringify(dat)]));
+  const gdata = lcall("GetMiniGame", game, Self.id, JSON.stringify(dat));
   roomScene.state = "replying";
   roomScene.popupBox.source = AppPath + "/" + gdata.qml_path + ".qml";
   if (dat) {
@@ -1652,7 +1642,7 @@ callbacks["AskForLuckCard"] = (j) => {
   // jsonData: int time
   if (config.observing || config.replaying) return;
   const time = parseInt(j);
-  roomScene.setPrompt(Backend.translate("#AskForLuckCard").arg(time), true);
+  roomScene.setPrompt(luatr("#AskForLuckCard").arg(time), true);
   roomScene.state = "replying";
   roomScene.extra_data = {
     luckCard: true,
diff --git a/Fk/PhotoElement/DelayedTrickArea.qml b/Fk/PhotoElement/DelayedTrickArea.qml
index 1b09672a..0d468130 100644
--- a/Fk/PhotoElement/DelayedTrickArea.qml
+++ b/Fk/PhotoElement/DelayedTrickArea.qml
@@ -35,7 +35,7 @@ Item {
       Image {
         height: 55 * 0.8
         width: 47 * 0.8
-        source: SkinBank.getDelayedTrickPicture(name) // SkinBank.DELAYED_TRICK_DIR + name
+        source: SkinBank.getDelayedTrickPicture(name)
       }
     }
   }
@@ -47,7 +47,7 @@ Item {
       inputs = [inputs];
     }
     inputs.forEach(card => {
-      const v = JSON.parse(Backend.callLuaFunction("GetVirtualEquip", [parent.playerid, card.cid]));
+      const v = lcall("GetVirtualEquip", parent.playerid, card.cid);
       if (v !== null) {
         cards.append(v);
       } else {
diff --git a/Fk/PhotoElement/EquipArea.qml b/Fk/PhotoElement/EquipArea.qml
index 01dd735f..b862ab12 100644
--- a/Fk/PhotoElement/EquipArea.qml
+++ b/Fk/PhotoElement/EquipArea.qml
@@ -17,9 +17,15 @@ Item {
 
   height: 70
   width: 138
-  property int itemHeight: (treasureItem.name === "" && !treasureItem.sealed) ? height / 3 : height / 4
-  property var items: [treasureItem, weaponItem, armorItem, defensiveHorseItem, offensiveHorseItem]
-  property var subtypes: ["treasure", "weapon", "armor", "defensive_horse", "offensive_horse"]
+  property int itemHeight: {
+    if (treasureItem.name === "" && !treasureItem.sealed)
+      return height / 3;
+    return height / 4;
+  }
+  property var items: [treasureItem, weaponItem, armorItem,
+    defensiveHorseItem, offensiveHorseItem]
+  property var subtypes: ["treasure", "weapon", "armor",
+    "defensive_horse", "offensive_horse"]
   property int length: area.length
 
   // FIXME: Qt 6.6
diff --git a/Fk/PhotoElement/EquipItem.qml b/Fk/PhotoElement/EquipItem.qml
index f519c985..b5be6f90 100644
--- a/Fk/PhotoElement/EquipItem.qml
+++ b/Fk/PhotoElement/EquipItem.qml
@@ -30,7 +30,11 @@ Item {
     anchors.verticalCenter: parent.verticalCenter
     x: 3
 
-    source: sealed ? (SkinBank.EQUIP_ICON_DIR + "sealed") : (icon ? SkinBank.getEquipIcon(cid, icon) : "")
+    source: {
+      if (sealed)
+        return SkinBank.EQUIP_ICON_DIR + "sealed";
+      return icon ? SkinBank.getEquipIcon(cid, icon) : "";
+    }
   }
 
   Image {
@@ -44,7 +48,7 @@ Item {
   GlowText {
     id: numberItem
     visible: !sealed && number > 0 && number < 14
-    text: Utility.convertNumber(number)
+    text: Util.convertNumber(number)
     color: "white"
     font.family: fontLibian.name
     font.pixelSize: 16
@@ -132,7 +136,7 @@ Item {
       text = "-1"
       icon = "horse";
     } else {
-      text = Backend.translate(name);
+      text = luatr(name);
       if (card.virt_name) {
         icon = card.virt_name;
       } else {
@@ -159,6 +163,6 @@ Item {
     x = 0;
 
     opacity = sealed ? 1 : 0;
-    text = '  ' + Backend.translate(subtype + "_sealed")
+    text = '  ' + luatr(subtype + "_sealed")
   }
 }
diff --git a/Fk/PhotoElement/HpBar.qml b/Fk/PhotoElement/HpBar.qml
index d78435b7..a494ec7a 100644
--- a/Fk/PhotoElement/HpBar.qml
+++ b/Fk/PhotoElement/HpBar.qml
@@ -20,13 +20,24 @@ Column {
     id: repeater
     model: column.visible ? 0 : maxValue
     Magatama {
-      state: (maxValue - 1 - index) >= value ? 0 : (value >= 3 || value >= maxValue ? 3 : (value <= 0 ? 0 : value))
+      state: {
+        if (maxValue - 1 - index >= value) {
+          return 0;
+        } else if (value >= 3 || value >= maxValue) {
+          return 3;
+        } else if (value <= 0) {
+          return 0;
+        } else {
+          return value;
+        }
+      }
     }
   }
 
   Column {
     id: column
-    visible: maxValue > 4 || value > maxValue || (shieldNum > 0 && maxValue > 3)
+    visible: maxValue > 4 || value > maxValue ||
+             (shieldNum > 0 && maxValue > 3)
     spacing: -4
 
     Magatama {
@@ -37,7 +48,17 @@ Column {
       id: hpItem
       width: root.width
       text: value
-      color: root.colors[(value >= 3 || value >= maxValue) ? 3 : (value <= 0 ? 0 : value)]
+      color: {
+        let idx;
+        if (value >= 3 || value >= maxValue) {
+          idx = 3;
+        } else if (value <= 0) {
+          idx = 0;
+        } else {
+          idx = value;
+        }
+        return root.colors[idx];
+      }
       font.family: fontLibian.name
       font.pixelSize: 22
       font.bold: true
diff --git a/Fk/PhotoElement/LimitSkillItem.qml b/Fk/PhotoElement/LimitSkillItem.qml
index 9493a0a7..ef81094d 100644
--- a/Fk/PhotoElement/LimitSkillItem.qml
+++ b/Fk/PhotoElement/LimitSkillItem.qml
@@ -25,7 +25,7 @@ Item {
     font.family: fontLi2.name
     style: Text.Outline
     styleColor: "#3D2D1C"
-    text: Backend.translate(skillname);
+    text: luatr(skillname);
   }
 
   Text {
@@ -39,7 +39,7 @@ Item {
   }
 
   onSkillnameChanged: {
-    let data = Backend.callLuaFunction("GetSkillData", [skillname]);
+    let data = lcall("GetSkillData", skillname);
     data = JSON.parse(data);
     if (data.frequency || data.switchSkillName) {
       skilltype = data.switchSkillName ? 'switch' : data.frequency;
@@ -64,7 +64,8 @@ Item {
       }
     } else if (skilltype === 'switch') {
       visible = true;
-      bg.source = SkinBank.LIMIT_SKILL_DIR + (usedtimes < 1 ? 'switch' : 'switch-yin');
+      bg.source = SkinBank.LIMIT_SKILL_DIR +
+        (usedtimes < 1 ? 'switch' : 'switch-yin');
     } else if (skilltype === 'quest') {
       visible = true
       if (usedtimes > 1) {
diff --git a/Fk/PhotoElement/MarkArea.qml b/Fk/PhotoElement/MarkArea.qml
index 8a1d625a..4b7deaa3 100644
--- a/Fk/PhotoElement/MarkArea.qml
+++ b/Fk/PhotoElement/MarkArea.qml
@@ -34,7 +34,8 @@ Item {
       width: childrenRect.width
       height: 22
       Text {
-        text: Backend.translate(mark_name) + ' ' + (special_value !== '' ? special_value : mark_extra)
+        text: luatr(mark_name) + ' '
+              + (special_value !== '' ? special_value : mark_extra)
         font.family: fontLibian.name
         font.pixelSize: 22
         font.letterSpacing: -0.6
@@ -76,7 +77,8 @@ Item {
 
             const mark_type = mark_name.slice(2, close_br);
             const _data = mark_extra;
-            let data = JSON.parse(Backend.callLuaFunction("GetQmlMark", [mark_type, mark_name, _data, root.parent?.playerid]));
+            let data = lcall("GetQmlMark", mark_type, mark_name, _data,
+                             root.parent?.playerid);
             if (data && data.qml_path) {
               params.data = JSON.parse(_data);
               roomScene.startCheat("../../" + data.qml_path, params);
@@ -84,7 +86,7 @@ Item {
             return;
           } else {
             if (!root.parent.playerid) return;
-            let data = JSON.parse(Backend.callLuaFunction("GetPile", [root.parent.playerid, mark_name]));
+            let data = lcall("GetPile", root.parent.playerid, mark_name);
             data = data.filter((e) => e !== -1);
             if (data.length === 0)
               return;
@@ -123,13 +125,16 @@ Item {
       if (close_br !== -1) {
         const mark_type = mark.slice(2, close_br);
         data = JSON.stringify(data);
-        const _data = JSON.parse(Backend.callLuaFunction("GetQmlMark", [mark_type, mark, data, root.parent?.playerid]));
+        const _data = lcall("GetQmlMark", mark_type, mark, data,
+                            root.parent?.playerid);
         if (_data && _data.text) {
           special_value = _data.text;
         }
       }
     } else {
-      data = data instanceof Array ? data.map((markText) => Backend.translate(markText)).join(' ') : Backend.translate(data);
+      data = data instanceof Array
+           ? data.map((markText) => luatr(markText)).join(' ')
+           : luatr(data);
     }
 
     if (modelItem) {
diff --git a/Fk/RoomElement/AG.qml b/Fk/RoomElement/AG.qml
index 40ac9b7a..b35c4f64 100644
--- a/Fk/RoomElement/AG.qml
+++ b/Fk/RoomElement/AG.qml
@@ -8,7 +8,7 @@ GraphicsBox {
   property bool interactive: false
 
   id: root
-  title.text: Backend.translate("Please choose cards")
+  title.text: luatr("Please choose cards")
   width: cards.count * 100 + spacing * (cards.count - 1) + 25
   height: 180
 
@@ -46,7 +46,7 @@ GraphicsBox {
 
   function addIds(ids) {
     ids.forEach((id) => {
-      let data = Backend.callLuaFunction("GetCardData", [id]);
+      let data = lcall("GetCardData", id);
       data = JSON.parse(data);
       data.selectable = true;
       data.footnote = "";
diff --git a/Fk/RoomElement/CardArea.qml b/Fk/RoomElement/CardArea.qml
index 7066a40d..f9d39708 100644
--- a/Fk/RoomElement/CardArea.qml
+++ b/Fk/RoomElement/CardArea.qml
@@ -26,7 +26,7 @@ Item {
     for (let j = 0; j < outputs.length; j++) {
       for (let i = cards.length - 1; i >= 0; i--) {
         if (outputs[j] === cards[i].cid) {
-          const state = JSON.parse(Backend.callLuaFunction("GetCardData", [cards[i].cid]));
+          const state = lcall("GetCardData", cards[i].cid);
           cards[i].setData(state);
           result.push(cards[i]);
           cards.splice(i, 1);
diff --git a/Fk/RoomElement/CardItem.qml b/Fk/RoomElement/CardItem.qml
index bd9cdc9f..ea4f4d0c 100644
--- a/Fk/RoomElement/CardItem.qml
+++ b/Fk/RoomElement/CardItem.qml
@@ -102,7 +102,8 @@ Item {
   Image {
     id: suitItem
     visible: known
-    source: (suit !== "" && suit !== "nosuit") ? SkinBank.CARD_SUIT_DIR + suit : ""
+    source: (suit !== "" && suit !== "nosuit") ? SkinBank.CARD_SUIT_DIR + suit
+                                               : ""
     x: 3
     y: 19
     width: 21
@@ -122,8 +123,10 @@ Item {
 
   Image {
     id: colorItem
-    visible: known && (suit === "" || suit === "nosuit") //  && number <= 0 // <- FIXME: 需要区分“黑色有点数”和“无色有点数”
-    source: (visible && color !== "") ? SkinBank.CARD_SUIT_DIR + "/" + color : ""
+    visible: known && (suit === "" || suit === "nosuit")
+      //  && number <= 0 // <- FIXME: 需要区分“黑色有点数”和“无色有点数”
+    source: (visible && color !== "") ? SkinBank.CARD_SUIT_DIR + "/" + color
+                                      : ""
     x: 1
   }
 
@@ -146,7 +149,7 @@ Item {
     font.pixelSize: 16
     font.family: fontLibian.name
     font.letterSpacing: -0.6
-    text: Backend.translate(root.virt_name)
+    text: luatr(root.virt_name)
   }
 
   Text {
@@ -195,7 +198,7 @@ Item {
         font.family: fontLibian.name
         font.letterSpacing: -0.6
         text: {
-          let ret = Backend.translate(modelData.k);
+          let ret = luatr(modelData.k);
           if (!modelData.k.startsWith("@@")) {
             ret += modelData.v.toString();
           }
diff --git a/Fk/RoomElement/CheckBox.qml b/Fk/RoomElement/CheckBox.qml
index b07c4edf..9839e46a 100644
--- a/Fk/RoomElement/CheckBox.qml
+++ b/Fk/RoomElement/CheckBox.qml
@@ -2,6 +2,7 @@
 
 import QtQuick
 import QtQuick.Layouts
+import Fk
 import Fk.Pages
 
 GraphicsBox {
@@ -14,22 +15,10 @@ GraphicsBox {
   property var result: []
 
   id: root
-  title.text: Backend.translate("$Choice").arg(Backend.translate(skill_name))
+  title.text: luatr("$Choice").arg(luatr(skill_name))
   width: Math.max(140, body.width + 20)
   height: buttons.height + body.height + title.height + 20
 
-  function processPrompt(prompt) {
-    const data = prompt.split(":");
-    let raw = Backend.translate(data[0]);
-    const src = parseInt(data[1]);
-    const dest = parseInt(data[2]);
-    if (raw.match("%src")) raw = raw.replace(/%src/g, Backend.translate(getPhoto(src).general));
-    if (raw.match("%dest")) raw = raw.replace(/%dest/g, Backend.translate(getPhoto(dest).general));
-    if (raw.match("%arg2")) raw = raw.replace(/%arg2/g, Backend.translate(data[4]));
-    if (raw.match("%arg")) raw = raw.replace(/%arg/g, Backend.translate(data[3]));
-    return raw;
-  }
-
   GridLayout {
     id: body
     // x: 10
@@ -44,8 +33,9 @@ GraphicsBox {
 
       MetroToggleButton {
         Layout.fillWidth: true
-        text: processPrompt(modelData)
-        enabled: options.indexOf(modelData) !== -1 && (root.result.length < max_num || triggered)
+        text: Util.processPrompt(modelData)
+        enabled: options.indexOf(modelData) !== -1
+                 && (root.result.length < max_num || triggered)
 
         onClicked: {
           if (triggered) {
@@ -68,7 +58,7 @@ GraphicsBox {
 
     MetroButton {
       Layout.fillWidth: true
-      text: processPrompt("OK")
+      text: Util.processPrompt("OK")
       enabled: root.result.length >= min_num
 
       onClicked: {
diff --git a/Fk/RoomElement/ChoiceBox.qml b/Fk/RoomElement/ChoiceBox.qml
index cf0106b6..364e05c1 100644
--- a/Fk/RoomElement/ChoiceBox.qml
+++ b/Fk/RoomElement/ChoiceBox.qml
@@ -2,6 +2,7 @@
 
 import QtQuick
 import QtQuick.Layouts
+import Fk
 import Fk.Pages
 
 GraphicsBox {
@@ -11,22 +12,10 @@ GraphicsBox {
   property int result
 
   id: root
-  title.text: Backend.translate("$Choice").arg(Backend.translate(skill_name))
+  title.text: luatr("$Choice").arg(luatr(skill_name))
   width: Math.max(140, body.width + 20)
   height: body.height + title.height + 20
 
-  function processPrompt(prompt) {
-    const data = prompt.split(":");
-    let raw = Backend.translate(data[0]);
-    const src = parseInt(data[1]);
-    const dest = parseInt(data[2]);
-    if (raw.match("%src")) raw = raw.replace(/%src/g, Backend.translate(getPhoto(src).general));
-    if (raw.match("%dest")) raw = raw.replace(/%dest/g, Backend.translate(getPhoto(dest).general));
-    if (raw.match("%arg2")) raw = raw.replace(/%arg2/g, Backend.translate(data[4]));
-    if (raw.match("%arg")) raw = raw.replace(/%arg/g, Backend.translate(data[3]));
-    return raw;
-  }
-
   GridLayout {
     id: body
     x: 10
@@ -40,7 +29,7 @@ GraphicsBox {
 
       MetroButton {
         Layout.fillWidth: true
-        text: processPrompt(modelData)
+        text: Util.processPrompt(modelData)
         enabled: options.indexOf(modelData) !== -1
 
         onClicked: {
diff --git a/Fk/RoomElement/ChooseGeneralBox.qml b/Fk/RoomElement/ChooseGeneralBox.qml
index ba5d2a6f..50c6adf8 100644
--- a/Fk/RoomElement/ChooseGeneralBox.qml
+++ b/Fk/RoomElement/ChooseGeneralBox.qml
@@ -19,10 +19,11 @@ GraphicsBox {
   }
 
   id: root
-  title.text: Backend.translate("$ChooseGeneral").arg(choiceNum) +
-    (config.enableFreeAssign ? "(" + Backend.translate("Enable free assign") + ")" : "")
+  title.text: luatr("$ChooseGeneral").arg(choiceNum) +
+    (config.enableFreeAssign ? "(" + luatr("Enable free assign") + ")" : "")
   width: generalArea.width + body.anchors.leftMargin + body.anchors.rightMargin
-  height: body.implicitHeight + body.anchors.topMargin + body.anchors.bottomMargin
+  height: body.implicitHeight + body.anchors.topMargin +
+          body.anchors.bottomMargin
 
   Column {
     id: body
@@ -32,7 +33,8 @@ GraphicsBox {
 
     Item {
       id: generalArea
-      width: (generalList.count > 8 ? Math.ceil(generalList.count / 2) : Math.max(3, generalList.count)) * 97
+      width: (generalList.count > 8 ? Math.ceil(generalList.count / 2)
+                                    : Math.max(3, generalList.count)) * 97
       height: generalList.count > 8 ? 290 : 150
       z: 1
 
@@ -43,8 +45,23 @@ GraphicsBox {
         Item {
           width: 93
           height: 130
-          x: (index % Math.ceil(generalList.count / (generalList.count > 8 ? 2 : 1))) * 98 + (generalList.count > 8 && index > generalList.count / 2 && generalList.count % 2 == 1 ? 50 : 0)
-          y: generalList.count <= 8 ? 0 : (index < generalList.count / 2 ? 0 : 135)
+          x: {
+            const count = generalList.count;
+            let columns = generalList.count;
+            if (columns > 8) {
+              columns = Math.ceil(columns / 2);
+            }
+
+            let ret = (index % columns) * 98;
+            if (count > 8 && index > count / 2 && count % 2 == 1)
+              ret += 50;
+            return ret;
+          }
+          y: {
+            if (generalList.count <= 8)
+              return 0;
+            return index < generalList.count / 2 ? 0 : 135;
+          }
         }
       }
     }
@@ -93,13 +110,15 @@ GraphicsBox {
         MetroButton {
           id: convertBtn
           visible: !convertDisabled
-          text: Backend.translate("Same General Convert")
-          onClicked: roomScene.startCheat("SameConvert", { cards: generalList });
+          text: luatr("Same General Convert")
+          onClicked: {
+            roomScene.startCheat("SameConvert", { cards: generalList });
+          }
         }
 
         MetroButton {
           id: fightButton
-          text: Backend.translate("Fight")
+          text: luatr("Fight")
           width: 120
           height: 35
           enabled: false
@@ -110,7 +129,7 @@ GraphicsBox {
         MetroButton {
           id: detailBtn
           enabled: choices.length > 0
-          text: Backend.translate("Show General Detail")
+          text: luatr("Show General Detail")
           onClicked: roomScene.startCheat(
             "GeneralDetail",
             { generals: choices }
@@ -233,7 +252,8 @@ GraphicsBox {
 
     for (i = 0; i < generalCardList.count; i++) {
       item = generalCardList.itemAt(i);
-      item.selectable = needSameKingdom ? isHegPair(selectedItem[0], item) : true;
+      item.selectable = needSameKingdom ? isHegPair(selectedItem[0], item)
+                                        : true;
       if (selectedItem.indexOf(item) != -1)
         continue;
 
@@ -247,9 +267,7 @@ GraphicsBox {
     }
 
     for (let i = 0; i < generalList.count; i++) {
-      if (JSON.parse(Backend.callLuaFunction(
-        "GetSameGenerals", [generalList.get(i).name])
-      ).length > 0) {
+      if (lcall("GetSameGenerals", generalList.get(i).name).length > 0) {
         convertBtn.enabled = true;
         return;
       }
diff --git a/Fk/RoomElement/ChooseHandcard.qml b/Fk/RoomElement/ChooseHandcard.qml
index 45281e18..5a4e9a36 100644
--- a/Fk/RoomElement/ChooseHandcard.qml
+++ b/Fk/RoomElement/ChooseHandcard.qml
@@ -13,7 +13,7 @@ ColumnLayout {
   property var cards: []
 
   Text {
-    text: Backend.translate("Handcard selector")
+    text: luatr("Handcard selector")
     Layout.fillWidth: true
     horizontalAlignment: Text.AlignHCenter
     font.pixelSize: 18
@@ -46,7 +46,7 @@ ColumnLayout {
         }
       }
       Component.onCompleted: {
-        setData(JSON.parse(Backend.callLuaFunction("GetCardData", [modelData.cid])));
+        setData(lcall("GetCardData", modelData.cid));
       }
     }
   }
diff --git a/Fk/RoomElement/Dashboard.qml b/Fk/RoomElement/Dashboard.qml
index 61dea611..6c9718dc 100644
--- a/Fk/RoomElement/Dashboard.qml
+++ b/Fk/RoomElement/Dashboard.qml
@@ -3,6 +3,7 @@
 import QtQuick
 import QtQuick.Layouts
 import Qt5Compat.GraphicalEffects
+import Fk
 
 RowLayout {
   id: root
@@ -86,19 +87,19 @@ RowLayout {
         data.y = parentPos.y;
         const card = component.createObject(roomScene, data);
         card.footnoteVisible = true;
-        card.footnote = Backend.translate("$Equip");
+        card.footnote = luatr("$Equip");
         handcardAreaItem.add(card);
       })
       handcardAreaItem.updateCardPosition();
     } else {
-      const ids = JSON.parse(Backend.callLuaFunction("GetPile", [self.playerid, pile]));
+      const ids = lcall("GetPile", self.playerid, pile);
       ids.forEach(id => {
-        const data = JSON.parse(Backend.callLuaFunction("GetCardData", [id]));
+        const data = lcall("GetCardData", id);
         data.x = parentPos.x;
         data.y = parentPos.y;
         const card = component.createObject(roomScene, data);
         card.footnoteVisible = true;
-        card.footnote = Backend.translate(pile);
+        card.footnote = luatr(pile);
         handcardAreaItem.add(card);
       });
       handcardAreaItem.updateCardPosition();
@@ -124,7 +125,7 @@ RowLayout {
       })
       handcardAreaItem.updateCardPosition();
     } else {
-      const ids = JSON.parse(Backend.callLuaFunction("GetPile", [self.playerid, pile]));
+      const ids = lcall("GetPile", self.playerid, pile);
       ids.forEach(id => {
         const card = handcardAreaItem.remove([id])[0];
         card.origX = parentPos.x;
@@ -145,25 +146,23 @@ RowLayout {
   // If cname is set, we are responding card.
   function enableCards(cname) {
     const cardValid = (cid, cname) => {
-      let ret = JSON.parse(Backend.callLuaFunction(
-        "CardFitPattern", [cid, cname]));
+      let ret = lcall("CardFitPattern", cid, cname);
 
       if (ret) {
         if (roomScene.respond_play) {
-          ret = ret && !JSON.parse(Backend.callLuaFunction(
-            "CardProhibitedResponse", [cid]));
+          ret = ret && !lcall("CardProhibitedResponse", cid);
         } else {
-          ret = ret && !JSON.parse(Backend.callLuaFunction(
-            "CardProhibitedUse", [cid]));
+          ret = ret && !lcall("CardProhibitedUse", cid);
         }
       }
 
       return ret;
     }
 
-    const pile_data = JSON.parse(Backend.callLuaFunction("GetAllPiles", [self.playerid]));
+    const pile_data = lcall("GetAllPiles", self.playerid);
     extractWoodenOx();
 
+    const handleMethod = roomScene.respond_play ? "response" : "use";
     if (cname) {
       const ids = [];
       let cards = handcardAreaItem.cards;
@@ -172,10 +171,8 @@ RowLayout {
         if (cardValid(cards[i].cid, cname)) {
           ids.push(cards[i].cid);
         } else {
-          const prohibitReason = Backend.callLuaFunction(
-            "GetCardProhibitReason",
-            [cards[i].cid, roomScene.respond_play ? "response" : "use", cname]
-          );
+          const prohibitReason = lcall("GetCardProhibitReason", cards[i].cid,
+                                       handleMethod, cname);
           if (prohibitReason) {
             cards[i].prohibitReason = prohibitReason;
           }
@@ -190,10 +187,8 @@ RowLayout {
             expandPile("_equip");
           }
         } else {
-          const prohibitReason = Backend.callLuaFunction(
-            "GetCardProhibitReason",
-            [c.cid, roomScene.respond_play ? "response" : "use", cname]
-          );
+          const prohibitReason = lcall("GetCardProhibitReason", c.cid,
+                                       handleMethod, cname);
           if (prohibitReason) {
             c.prohibitReason = prohibitReason;
           }
@@ -223,14 +218,15 @@ RowLayout {
     const ids = [], cards = handcardAreaItem.cards;
     for (let i = 0; i < cards.length; i++) {
       cards[i].prohibitReason = "";
-      if (JSON.parse(Backend.callLuaFunction("CanUseCard", [cards[i].cid, Self.id, JSON.stringify(roomScene.extra_data)]))) {
+      if (lcall("CanUseCard", cards[i].cid, Self.id,
+                JSON.stringify(roomScene.extra_data))) {
         ids.push(cards[i].cid);
       } else {
         // cannot use? considering special_skills
-        const skills = JSON.parse(Backend.callLuaFunction("GetCardSpecialSkills", [cards[i].cid]));
+        const skills = lcall("GetCardSpecialSkills", cards[i].cid);
         for (let j = 0; j < skills.length; j++) {
           const s = skills[j];
-          if (JSON.parse(Backend.callLuaFunction("ActiveCanUse", [s, JSON.stringify(roomScene.extra_data)]))) {
+          if (lcall("ActiveCanUse", s, JSON.stringify(roomScene.extra_data))) {
             ids.push(cards[i].cid);
             break;
           }
@@ -238,7 +234,8 @@ RowLayout {
 
         // still cannot use? show message on card
         if (!ids.includes(cards[i].cid)) {
-          const prohibitReason = Backend.callLuaFunction("GetCardProhibitReason", [cards[i].cid, "play"]);
+          const prohibitReason = lcall("GetCardProhibitReason", cards[i].cid,
+                                       "play");
           if (prohibitReason) {
             cards[i].prohibitReason = prohibitReason;
           }
@@ -304,21 +301,10 @@ RowLayout {
     }
   }
 
-  function processPrompt(prompt) {
-    const data = prompt.split(":");
-    let raw = Backend.translate(data[0]);
-    const src = parseInt(data[1]);
-    const dest = parseInt(data[2]);
-    if (raw.match("%src")) raw = raw.replace(/%src/g, Backend.translate(getPhoto(src).general));
-    if (raw.match("%dest")) raw = raw.replace(/%dest/g, Backend.translate(getPhoto(dest).general));
-    if (raw.match("%arg2")) raw = raw.replace(/%arg2/g, Backend.translate(data[4]));
-    if (raw.match("%arg")) raw = raw.replace(/%arg/g, Backend.translate(data[3]));
-    return raw;
-  }
-
   function extractWoodenOx() {
-    const pile_data = JSON.parse(Backend.callLuaFunction("GetAllPiles", [self.playerid]));
-    if (!roomScene.autoPending) { // 先屏蔽AskForUseActiveSkill再说，这下只剩使用打出以及出牌阶段了
+    const pile_data = lcall("GetAllPiles", self.playerid);
+    if (!roomScene.autoPending) {
+      // 先屏蔽AskForUseActiveSkill再说，这下只剩使用打出以及出牌阶段了
       for (let name in pile_data) {
         if (name.endsWith("&")) expandPile(name);
       }
@@ -331,28 +317,21 @@ RowLayout {
 
     const enabled_cards = [];
     const targets = roomScene.selected_targets;
-    const prompt = JSON.parse(Backend.callLuaFunction(
-      "ActiveSkillPrompt",
-      [pending_skill, pendings, targets]
-    ));
+    const prompt = lcall("ActiveSkillPrompt", pending_skill, pendings,
+                         targets);
     if (prompt !== "") {
-      roomScene.setPrompt(processPrompt(prompt));
+      roomScene.setPrompt(Util.processPrompt(prompt));
     }
 
     handcardAreaItem.cards.forEach((card) => {
-      if (card.selected || JSON.parse(Backend.callLuaFunction(
-        "ActiveCardFilter",
-        [pending_skill, card.cid, pendings, targets]
-      )))
+      if (card.selected || lcall("ActiveCardFilter", pending_skill, card.cid,
+                                 pendings, targets))
         enabled_cards.push(card.cid);
     });
 
     const cards = self.equipArea.getAllCards();
     cards.forEach(c => {
-      if (JSON.parse(Backend.callLuaFunction(
-        "ActiveCardFilter",
-        [pending_skill, c.cid, pendings, targets]
-      ))) {
+      if (lcall("ActiveCardFilter", pending_skill, c.cid, pendings, targets)) {
         enabled_cards.push(c.cid);
         if (!expanded_piles["_equip"]) {
           expandPile("_equip");
@@ -360,13 +339,10 @@ RowLayout {
       }
     })
 
-    const pile = Backend.callLuaFunction("GetExpandPileOfSkill", [pending_skill]);
-    const pile_ids = JSON.parse(Backend.callLuaFunction("GetPile", [self.playerid, pile]));
+    const pile = lcall("GetExpandPileOfSkill", pending_skill);
+    const pile_ids = lcall("GetPile", self.playerid, pile);
     pile_ids.forEach(cid => {
-      if (JSON.parse(Backend.callLuaFunction(
-        "ActiveCardFilter",
-        [pending_skill, cid, pendings, targets]
-      ))) {
+      if (lcall("ActiveCardFilter", pending_skill, cid, pendings, targets)) {
         enabled_cards.push(cid);
       };
       if (!expanded_piles[pile]) {
@@ -376,10 +352,7 @@ RowLayout {
 
     handcardAreaItem.enableCards(enabled_cards);
 
-    if (JSON.parse(Backend.callLuaFunction(
-        "CanViewAs",
-        [pending_skill, pendings]
-      ))) {
+    if (lcall("CanViewAs", pending_skill, pendings)) {
       pending_card = {
         skill: pending_skill,
         subcards: pendings
@@ -462,8 +435,8 @@ RowLayout {
           continue;
         }
 
-        const fitpattern = JSON.parse(Backend.callLuaFunction("SkillFitPattern", [item.orig, cname]));
-        const canresp = JSON.parse(Backend.callLuaFunction("SkillCanResponse", [item.orig, cardResponsing]));
+        const fitpattern = lcall("SkillFitPattern", item.orig, cname);
+        const canresp = lcall("SkillCanResponse", item.orig, cardResponsing);
         item.enabled = fitpattern && canresp;
       }
       return;
@@ -475,7 +448,8 @@ RowLayout {
         continue;
       }
 
-      item.enabled = JSON.parse(Backend.callLuaFunction("ActiveCanUse", [item.orig, JSON.stringify(roomScene.extra_data)]));
+      item.enabled = lcall("ActiveCanUse", item.orig,
+                           JSON.stringify(roomScene.extra_data));
     }
   }
 
@@ -490,10 +464,9 @@ RowLayout {
   }
 
   function updateHandcards() {
-    Backend.callLuaFunction("FilterMyHandcards", []);
+    lcall("FilterMyHandcards");
     handcardAreaItem.cards.forEach(v => {
-      const data = JSON.parse(Backend.callLuaFunction("GetCardData", [v.cid]));
-      v.setData(data);
+      v.setData(lcall("GetCardData", v.cid));
     });
   }
 
@@ -514,12 +487,12 @@ RowLayout {
 
     skillPanel.clearSkills();
 
-    const skills = JSON.parse(Backend.callLuaFunction("GetPlayerSkills", [Self.id]));
+    const skills = lcall("GetPlayerSkills", Self.id);
     for (let s of skills) {
       addSkill(s.name);
     }
 
-    cards = roomScene.drawPile.remove(JSON.parse(Backend.callLuaFunction("GetPlayerHandcards", [Self.id])));
+    cards = roomScene.drawPile.remove(lcall("GetPlayerHandcards", Self.id));
     handcardAreaItem.add(cards);
   }
 }
diff --git a/Fk/RoomElement/DetailedCheckBox.qml b/Fk/RoomElement/DetailedCheckBox.qml
index f9bae3a0..7a435bc7 100644
--- a/Fk/RoomElement/DetailedCheckBox.qml
+++ b/Fk/RoomElement/DetailedCheckBox.qml
@@ -15,7 +15,7 @@ GraphicsBox {
   property var result: []
 
   id: root
-  title.text: Backend.translate("$Choice").arg(Backend.translate(skill_name))
+  title.text: luatr("$Choice").arg(luatr(skill_name))
   width: Math.max(140, body.width + 20)
   height: buttons.height + body.height + title.height + 20
 
@@ -38,8 +38,9 @@ GraphicsBox {
       MetroToggleButton {
         id: choicetitle
         width: parent.width
-        text: Backend.translate(modelData)
-        enabled: options.indexOf(modelData) !== -1 && (root.result.length < max_num || triggered)
+        text: luatr(modelData)
+        enabled: options.indexOf(modelData) !== -1
+                 && (root.result.length < max_num || triggered)
         textFont.pixelSize: 24
         anchors.top: choiceDetail.bottom
         anchors.topMargin: 8
@@ -64,7 +65,7 @@ GraphicsBox {
         Text {
           id: detail
           width: parent.width
-          text: Backend.translate(":" + modelData)
+          text: luatr(":" + modelData)
           color: "white"
           wrapMode: Text.WordWrap
           font.pixelSize: 16
@@ -84,7 +85,7 @@ GraphicsBox {
     MetroButton {
       width: 120
       height: 35
-      text: Backend.translate("OK")
+      text: luatr("OK")
       enabled: root.result.length >= min_num
 
       onClicked: {
@@ -95,7 +96,7 @@ GraphicsBox {
     MetroButton {
       width: 120
       height: 35
-      text: Backend.translate("Cancel")
+      text: luatr("Cancel")
       visible: root.cancelable
 
       onClicked: {
diff --git a/Fk/RoomElement/DetailedChoiceBox.qml b/Fk/RoomElement/DetailedChoiceBox.qml
index 43c139a2..ddcd9b44 100644
--- a/Fk/RoomElement/DetailedChoiceBox.qml
+++ b/Fk/RoomElement/DetailedChoiceBox.qml
@@ -12,7 +12,7 @@ GraphicsBox {
   property int result
 
   id: root
-  title.text: Backend.translate("$Choice").arg(Backend.translate(skill_name))
+  title.text: luatr("$Choice").arg(luatr(skill_name))
   width: Math.max(140, body.width + 20)
   height: body.height + title.height + 20
 
@@ -35,7 +35,7 @@ GraphicsBox {
       MetroButton {
         id: choicetitle
         width: parent.width
-        text: Backend.translate(modelData)
+        text: luatr(modelData)
         enabled: options.indexOf(modelData) !== -1
         textFont.pixelSize: 24
         anchors.top: choiceDetail.bottom
@@ -57,7 +57,7 @@ GraphicsBox {
         Text {
           id: detail
           width: parent.width
-          text: Backend.translate(":" + modelData)
+          text: luatr(":" + modelData)
           color: "white"
           wrapMode: Text.WordWrap
           font.pixelSize: 16
diff --git a/Fk/RoomElement/GameOverBox.qml b/Fk/RoomElement/GameOverBox.qml
index f5a91bad..6928fd95 100644
--- a/Fk/RoomElement/GameOverBox.qml
+++ b/Fk/RoomElement/GameOverBox.qml
@@ -7,7 +7,7 @@ GraphicsBox {
   property string winner: ""
 
   id: root
-  title.text: Backend.translate("$GameOver")
+  title.text: luatr("$GameOver")
   width: Math.max(140, body.width + 20)
   height: body.height + title.height + 20
 
@@ -18,12 +18,13 @@ GraphicsBox {
     spacing: 10
 
     Text {
-      text: winner !== "" ? Backend.translate("$Winner").arg(Backend.translate(winner)) : Backend.translate("$NoWinner")
+      text: winner !== "" ? luatr("$Winner").arg(luatr(winner))
+                          : luatr("$NoWinner")
       color: "#E4D5A0"
     }
 
     MetroButton {
-      text: Backend.translate("Back To Room")
+      text: luatr("Back To Room")
       anchors.horizontalCenter: parent.horizontalCenter
       visible: !config.observing
 
@@ -34,7 +35,7 @@ GraphicsBox {
     }
 
     MetroButton {
-      text: Backend.translate("Back To Lobby")
+      text: luatr("Back To Lobby")
       anchors.horizontalCenter: parent.horizontalCenter
 
       onClicked: {
@@ -49,13 +50,13 @@ GraphicsBox {
 
     MetroButton {
       id: repBtn
-      text: Backend.translate("Save Replay")
+      text: luatr("Save Replay")
       anchors.horizontalCenter: parent.horizontalCenter
       visible: !config.replaying
 
       onClicked: {
         repBtn.visible = false;
-        Backend.callLuaFunction("SaveRecord", []);
+        lcall("SaveRecord");
         toast.show("OK.");
       }
     }
diff --git a/Fk/RoomElement/GeneralCardItem.qml b/Fk/RoomElement/GeneralCardItem.qml
index 70bac4e5..87332f2a 100644
--- a/Fk/RoomElement/GeneralCardItem.qml
+++ b/Fk/RoomElement/GeneralCardItem.qml
@@ -29,11 +29,13 @@ CardItem {
   suit: ""
   number: 0
   footnote: ""
-  card.source: known ? SkinBank.getGeneralPicture(name) : (SkinBank.GENERALCARD_DIR + 'card-back')
+  card.source: known ? SkinBank.getGeneralPicture(name)
+                     : (SkinBank.GENERALCARD_DIR + 'card-back')
   glow.color: "white" //Engine.kingdomColor[kingdom]
 
   // FIXME: 藕！！
-  property bool heg: name.startsWith('hs__') || name.startsWith('ld__') || name.includes('heg__')
+  property bool heg: name.startsWith('hs__') || name.startsWith('ld__') ||
+                     name.includes('heg__')
 
   Image {
     source: known ? (SkinBank.GENERALCARD_DIR + "border") : ""
@@ -51,7 +53,8 @@ CardItem {
     scale: 0.6; x: 9; y: 12
     transformOrigin: Item.TopLeft
     width: 34; fillMode: Image.PreserveAspectFit
-    source: subkingdom ? SkinBank.getGeneralCardDir(subkingdom) + subkingdom : ""
+    source: subkingdom ? SkinBank.getGeneralCardDir(subkingdom) + subkingdom
+                       : ""
     visible: detailed && known
   }
 
@@ -72,7 +75,8 @@ CardItem {
         Image {
           id: subkingdomMagatama
           visible: false
-          source: subkingdom ? SkinBank.getGeneralCardDir(subkingdom) + subkingdom + "-magatama" : ""
+          source: subkingdom ? SkinBank.getGeneralCardDir(subkingdom) +
+                               subkingdom + "-magatama" : ""
         }
         LinearGradient {
           id: subkingdomMask
@@ -153,8 +157,8 @@ CardItem {
     height: 80
     x: 2
     y: lineCount > 6 ? 30 : 34
-    text: name !== "" ? Backend.translate(name) : "nil"
-    visible: Backend.translate(name).length <= 6 && detailed && known
+    text: name !== "" ? luatr(name) : "nil"
+    visible: luatr(name).length <= 6 && detailed && known
     color: "white"
     font.family: fontLibian.name
     font.pixelSize: 18
@@ -168,8 +172,8 @@ CardItem {
     y: 12
     rotation: 90
     transformOrigin: Item.BottomLeft
-    text: Backend.translate(name)
-    visible: Backend.translate(name).length > 6 && detailed && known
+    text: luatr(name)
+    visible: luatr(name).length > 6 && detailed && known
     color: "white"
     font.family: fontLibian.name
     font.pixelSize: 18
@@ -191,7 +195,7 @@ CardItem {
     border.color: "white"
     border.width: 1
     Text {
-      text: Backend.translate(pkgName)
+      text: luatr(pkgName)
       x: 2; y: 1
       font.family: fontLibian.name
       font.pixelSize: 14
@@ -202,7 +206,7 @@ CardItem {
   }
 
   onNameChanged: {
-    const data = JSON.parse(Backend.callLuaFunction("GetGeneralData", [name]));
+    const data = lcall("GetGeneralData", name);
     kingdom = data.kingdom;
     subkingdom = (data.subkingdom !== kingdom && data.subkingdom) || "";
     hp = data.hp;
diff --git a/Fk/RoomElement/GuanxingBox.qml b/Fk/RoomElement/GuanxingBox.qml
index b70d34d9..0023ad34 100644
--- a/Fk/RoomElement/GuanxingBox.qml
+++ b/Fk/RoomElement/GuanxingBox.qml
@@ -14,7 +14,7 @@ GraphicsBox {
   property var areaNames: []
   property int padding: 25
 
-  title.text: Backend.translate(prompt !== "" ? prompt : "Please arrange cards")
+  title.text: luatr(prompt !== "" ? prompt : "Please arrange cards")
   width: body.width + padding * 2
   height: title.height + body.height + padding * 2
 
@@ -32,7 +32,8 @@ GraphicsBox {
         spacing: 5
 
         property int areaCapacity: modelData
-        property string areaName: index < areaNames.length ? qsTr(areaNames[index]) : ""
+        property string areaName: index < areaNames.length
+                                  ? qsTr(areaNames[index]) : ""
 
         Rectangle {
           anchors.verticalCenter: parent.verticalCenter
@@ -81,7 +82,7 @@ GraphicsBox {
     MetroButton {
       Layout.alignment: Qt.AlignHCenter
       id: buttonConfirm
-      text: Backend.translate("OK")
+      text: luatr("OK")
       width: 120
       height: 35
 
diff --git a/Fk/RoomElement/HandcardArea.qml b/Fk/RoomElement/HandcardArea.qml
index 2d96bea1..8541d7d9 100644
--- a/Fk/RoomElement/HandcardArea.qml
+++ b/Fk/RoomElement/HandcardArea.qml
@@ -46,7 +46,7 @@ Item {
       card = result[i];
       card.draggable = false;
       card.selectable = false;
-      card.showDetail = false;
+      // card.showDetail = false;
       card.selectedChanged.disconnect(adjustCards);
       card.prohibitReason = "";
     }
@@ -57,7 +57,7 @@ Item {
   {
     let card, i;
     cards.forEach(card => {
-      card.selectable = cardIds.contains(card.cid);
+      card.selectable = cardIds.includes(card.cid);
       if (!card.selectable) {
         card.selected = false;
         unselectCard(card);
@@ -93,10 +93,10 @@ Item {
     for (let i = 0; i < cards.length; i++) {
       const card = cards[i];
       if (card.selected) {
-        if (!selectedCards.contains(card))
+        if (!selectedCards.includes(card))
           selectCard(card);
       } else {
-        if (selectedCards.contains(card))
+        if (selectedCards.includes(card))
           unselectCard(card);
       }
     }
diff --git a/Fk/RoomElement/IndicatorLine.qml b/Fk/RoomElement/IndicatorLine.qml
index 00531b70..14ea6511 100644
--- a/Fk/RoomElement/IndicatorLine.qml
+++ b/Fk/RoomElement/IndicatorLine.qml
@@ -20,7 +20,8 @@ Item {
 
     Rectangle {
       width: 6
-      height: Math.sqrt(Math.pow(modelData.x - start.x, 2) + Math.pow(modelData.y - start.y, 2)) * ratio
+      height: Math.sqrt(Math.pow(modelData.x - start.x, 2) +
+                        Math.pow(modelData.y - start.y, 2)) * ratio
       x: start.x
       y: start.y
       antialiasing: true
diff --git a/Fk/RoomElement/InvisibleCardArea.qml b/Fk/RoomElement/InvisibleCardArea.qml
index 14e0a570..25ba6ea4 100644
--- a/Fk/RoomElement/InvisibleCardArea.qml
+++ b/Fk/RoomElement/InvisibleCardArea.qml
@@ -59,11 +59,12 @@ Item {
     const items = [];
     for (let i = 0; i < outputs.length; i++) {
       if (_contains(outputs[i])) {
-        const state = JSON.parse(Backend.callLuaFunction("GetCardData", [outputs[i]]))
+        const state = lcall("GetCardData", outputs[i]);
         state.x = parentPos.x;
         state.y = parentPos.y;
         state.opacity = 0;
         card = component.createObject(roomScene.dynamicCardArea, state);
+        card.showDetail = true
         card.x -= card.width / 2;
         card.x += (i - outputs.length / 2) * 15;
         card.y -= card.height / 2;
@@ -93,7 +94,8 @@ Item {
       const parentPos = roomScene.mapFromItem(root, 0, 0);
       for (i = 0; i < pendingInput.length; i++) {
         card = pendingInput[i];
-        card.origX = parentPos.x - card.width / 2 + ((i - pendingInput.length / 2) * 15);
+        card.origX = parentPos.x - card.width / 2
+                   + ((i - pendingInput.length / 2) * 15);
         card.origY = parentPos.y - card.height / 2;
         card.origOpacity = 0;
         card.destroyOnStop();
diff --git a/Fk/RoomElement/MiscStatus.qml b/Fk/RoomElement/MiscStatus.qml
index 00116dbb..9e7e7630 100644
--- a/Fk/RoomElement/MiscStatus.qml
+++ b/Fk/RoomElement/MiscStatus.qml
@@ -19,7 +19,7 @@ Item {
   Text {
     id: roundTxt
     anchors.right: parent.right
-    text: Backend.translate("#currentRoundNum").arg(roundNum)
+    text: luatr("#currentRoundNum").arg(roundNum)
     color: "#F0E5DA"
     font.pixelSize: 18
     font.family: fontLibian.name
diff --git a/Fk/RoomElement/MoveCardInBoardBox.qml b/Fk/RoomElement/MoveCardInBoardBox.qml
index f88f3773..eea07571 100644
--- a/Fk/RoomElement/MoveCardInBoardBox.qml
+++ b/Fk/RoomElement/MoveCardInBoardBox.qml
@@ -13,7 +13,7 @@ GraphicsBox {
   property var result
   property int padding: 25
 
-  title.text: Backend.translate("Please click to move card")
+  title.text: luatr("Please click to move card")
   width: body.width + padding * 2
   height: title.height + body.height + padding * 2
 
@@ -65,7 +65,7 @@ GraphicsBox {
             Text {
               horizontalAlignment: Text.AlignHCenter
               anchors.centerIn: parent
-              text: Backend.translate(modelData.subtype)
+              text: luatr(modelData.subtype)
               color: "#90765F"
               font.family: fontLibian.name
                font.pixelSize: 16
@@ -81,7 +81,7 @@ GraphicsBox {
     MetroButton {
       Layout.alignment: Qt.AlignHCenter
       id: buttonConfirm
-      text: Backend.translate("OK")
+      text: luatr("OK")
       width: 120
       height: 35
       enabled: false
@@ -131,7 +131,8 @@ GraphicsBox {
       const index = cards.findIndex(data => item.cid === data.cid);
       result && (result.pos = cardsPosition[index]);
 
-      const cardPos = cardsPosition[index] === 0 ? (result ? 1 : 0) : (result ? 0 : 1);
+      const cardPos = cardsPosition[index] === 0 ? (result ? 1 : 0)
+                                                 : (result ? 0 : 1);
       const curArea = areaRepeater.itemAt(cardPos);
       const curBox = curArea.cardRepeater.itemAt(index);
       const curPos = mapFromItem(curArea, curBox.x, curBox.y);
diff --git a/Fk/RoomElement/Photo.qml b/Fk/RoomElement/Photo.qml
index 869d0e60..bbd9bbe4 100644
--- a/Fk/RoomElement/Photo.qml
+++ b/Fk/RoomElement/Photo.qml
@@ -187,7 +187,8 @@ Item {
           return "";
         }
         if (deputyGeneral) {
-          return SkinBank.getGeneralExtraPic(general, "dual/") ?? SkinBank.getGeneralPicture(general);
+          return SkinBank.getGeneralExtraPic(general, "dual/")
+              ?? SkinBank.getGeneralPicture(general);
         } else {
           return SkinBank.getGeneralPicture(general)
         }
@@ -204,7 +205,8 @@ Item {
       source: {
         const general = deputyGeneral;
         if (deputyGeneral != "") {
-          return SkinBank.getGeneralExtraPic(general, "dual/") ?? SkinBank.getGeneralPicture(general);
+          return SkinBank.getGeneralExtraPic(general, "dual/")
+              ?? SkinBank.getGeneralPicture(general);
         } else {
           return "";
         }
@@ -231,7 +233,7 @@ Item {
       color: "white"
       width: 24
       wrapMode: Text.WrapAnywhere
-      text: Backend.translate(deputyGeneral)
+      text: luatr(deputyGeneral)
       style: Text.Outline
     }
   }
@@ -280,7 +282,7 @@ Item {
 
     GlowText {
       Layout.alignment: Qt.AlignCenter
-      text: Backend.translate("resting...")
+      text: luatr("resting...")
       font.family: fontLibian.name
       font.pixelSize: 40
       font.bold: true
@@ -304,7 +306,7 @@ Item {
     GlowText {
       Layout.alignment: Qt.AlignCenter
       visible: root.rest > 0 && root.rest < 999
-      text: Backend.translate("rest round num")
+      text: luatr("rest round num")
       font.family: fontLibian.name
       font.pixelSize: 28
       color: "#F0E5D6"
@@ -334,11 +336,11 @@ Item {
       style: Text.Outline
       text: {
         if (totalGame === 0) {
-          return Backend.translate("Newbie");
+          return luatr("Newbie");
         }
         const winRate = (winGame / totalGame) * 100;
         const runRate = (runGame / totalGame) * 100;
-        return Backend.translate("Win=%1\nRun=%2\nTotal=%3")
+        return luatr("Win=%1\nRun=%2\nTotal=%3")
           .arg(winRate.toFixed(2))
           .arg(runRate.toFixed(2))
           .arg(totalGame);
@@ -351,7 +353,8 @@ Item {
     anchors.right: parent.right
     anchors.bottomMargin: -8
     anchors.rightMargin: 4
-    source: SkinBank.PHOTO_DIR + (isOwner ? "owner" : (ready ? "ready" : "notready"))
+    source: SkinBank.PHOTO_DIR +
+            (isOwner ? "owner" : (ready ? "ready" : "notready"))
     visible: screenName != "" && !roomScene.isStarted
   }
 
@@ -393,7 +396,7 @@ Item {
     }
 
     function updatePileInfo(areaName) {
-      const data = JSON.parse(Backend.callLuaFunction("GetPile", [root.playerid, areaName]));
+      const data = lcall("GetPile", root.playerid, areaName);
       if (data.length === 0) {
         root.markArea.removeMark(areaName);
       } else {
@@ -460,7 +463,14 @@ Item {
     x: -6
 
     Text {
-      text: (root.maxCard === root.hp || root.hp < 0 ) ? (root.handcards) : (root.handcards + "/" + (root.maxCard < 900 ? root.maxCard : "∞"))
+      text: {
+        if (root.maxCard === root.hp || root.hp < 0) {
+          return root.handcards;
+        } else {
+          const maxCard = root.maxCard < 900 ? root.maxCard : "∞";
+          return root.handcards + "/" + maxCard;
+        }
+      }
       font.family: fontLibian.name
       font.pixelSize: (root.maxCard === root.hp || root.hp < 0 ) ? 32 : 27
       //font.weight: 30
@@ -472,10 +482,11 @@ Item {
     }
 
     TapHandler {
-      enabled: (root.state != "candidate" || !root.selectable) && root.playerid !== Self.id
+      enabled: (root.state != "candidate" || !root.selectable)
+               && root.playerid !== Self.id
       onTapped: {
         const params = { name: "hand_card" };
-        let data = JSON.parse(Backend.callLuaFunction("GetPlayerHandcards", [root.playerid]));
+        let data = lcall("GetPlayerHandcards", root.playerid);
         data = data.filter((e) => e !== -1);
         if (data.length === 0)
           return;
@@ -532,7 +543,12 @@ Item {
     anchors.topMargin: 2
 
     font.pixelSize: 16
-    text: (config.blockedUsers && config.blockedUsers.includes(screenName) ? Backend.translate("<Blocked> ") : "") + screenName
+    text: {
+      let ret = screenName;
+      if (config.blockedUsers?.includes(screenName))
+        ret = luatr("<Blocked> ") + ret;
+      return ret;
+    }
 
     glow.radius: 8
   }
@@ -549,7 +565,10 @@ Item {
     anchors.horizontalCenter: parent.horizontalCenter
     anchors.bottom: parent.bottom
     anchors.bottomMargin: -32
-    property var seatChr: ["一", "二", "三", "四", "五", "六", "七", "八", "九", "十", "十一", "十二"]
+    property var seatChr: [
+      "一", "二", "三", "四", "五", "六",
+      "七", "八", "九", "十", "十一", "十二",
+    ]
     font.family: fontLi2.name
     font.pixelSize: 32
     text: seatChr[seatNumber - 1]
@@ -705,7 +724,7 @@ Item {
 
   onGeneralChanged: {
     if (!roomScene.isStarted) return;
-    const text = Backend.translate(general);
+    const text = luatr(general);
     if (text.length > 6) {
       generalName.text = "";
       longGeneralName.text = text;
@@ -713,8 +732,6 @@ Item {
       generalName.text = text;
       longGeneralName.text = "";
     }
-    // let data = JSON.parse(Backend.callLuaFunction("GetGeneralData", [general]));
-    // kingdom = data.kingdom;
   }
 
   function chat(msg) {
diff --git a/Fk/RoomElement/PlayerCardBox.qml b/Fk/RoomElement/PlayerCardBox.qml
index 1139dd8f..1d4fcfdb 100644
--- a/Fk/RoomElement/PlayerCardBox.qml
+++ b/Fk/RoomElement/PlayerCardBox.qml
@@ -2,13 +2,18 @@
 
 import QtQuick
 import QtQuick.Layouts
+import Fk
 import Fk.Pages
 
 GraphicsBox {
   id: root
   property string prompt
 
-  title.text: prompt === "" ? (root.multiChoose ? Backend.translate("$ChooseCards").arg(root.min).arg(root.max) : Backend.translate("$ChooseCard")) : processPrompt(prompt)
+  title.text: prompt === "" ?
+                (root.multiChoose ?
+                   luatr("$ChooseCards").arg(root.min).arg(root.max)
+                   : luatr("$ChooseCard"))
+                : Util.processPrompt(prompt)
 
   // TODO: Adjust the UI design in case there are more than 7 cards
   width: 70 + 700
@@ -50,7 +55,7 @@ GraphicsBox {
 
         Text {
           color: "#E4D5A0"
-          text: Backend.translate(areaName)
+          text: luatr(areaName)
           anchors.fill: parent
           wrapMode: Text.WrapAnywhere
           verticalAlignment: Text.AlignVCenter
@@ -95,26 +100,15 @@ GraphicsBox {
 
   MetroButton {
     anchors.bottom: parent.bottom
-    text: Backend.translate("OK")
+    text: luatr("OK")
     visible: root.multiChoose
-    enabled: root.selected_ids.length <= root.max && root.selected_ids.length >= root.min
+    enabled: root.selected_ids.length <= root.max
+             && root.selected_ids.length >= root.min
     onClicked: root.cardsSelected(root.selected_ids)
   }
 
   onCardSelected: finished();
 
-  function processPrompt(prompt) {
-    const data = prompt.split(":");
-    let raw = Backend.translate(data[0]);
-    const src = parseInt(data[1]);
-    const dest = parseInt(data[2]);
-    if (raw.match("%src")) raw = raw.replace(/%src/g, Backend.translate(getPhoto(src).general));
-    if (raw.match("%dest")) raw = raw.replace(/%dest/g, Backend.translate(getPhoto(dest).general));
-    if (raw.match("%arg2")) raw = raw.replace(/%arg2/g, Backend.translate(data[4]));
-    if (raw.match("%arg")) raw = raw.replace(/%arg/g, Backend.translate(data[3]));
-    return raw;
-  }
-
   function findAreaModel(name) {
     let ret;
     for (let i = 0; i < cardModel.count; i++) {
diff --git a/Fk/RoomElement/PoxiBox.qml b/Fk/RoomElement/PoxiBox.qml
index 3abdd791..27340916 100644
--- a/Fk/RoomElement/PoxiBox.qml
+++ b/Fk/RoomElement/PoxiBox.qml
@@ -7,7 +7,7 @@ import Fk.Pages
 GraphicsBox {
   id: root
 
-  title.text: Backend.callLuaFunction("PoxiPrompt", [poxi_type, card_data, extra_data])
+  title.text: lcall("PoxiPrompt", poxi_type, card_data, extra_data)
 
   // TODO: Adjust the UI design in case there are more than 7 cards
   width: 70 + 700
@@ -50,7 +50,7 @@ GraphicsBox {
 
         Text {
           color: "#E4D5A0"
-          text: Backend.translate(areaName)
+          text: luatr(areaName)
           anchors.fill: parent
           wrapMode: Text.WrapAnywhere
           verticalAlignment: Text.AlignVCenter
@@ -71,12 +71,10 @@ GraphicsBox {
             number: model.number || 0
             autoBack: false
             known: model.cid !== -1
-            selectable: {
-              return root.selected_ids.includes(model.cid) || JSON.parse(Backend.callLuaFunction(
-                "PoxiFilter",
-                [root.poxi_type, model.cid, root.selected_ids, root.card_data, root.extra_data]
-              ));
-            }
+            selectable: root.selected_ids.includes(model.cid) ||
+              lcall("PoxiFilter", root.poxi_type, model.cid, root.selected_ids,
+                    root.card_data, root.extra_data);
+
             onSelectedChanged: {
               if (selected) {
                 chosenInBox = true;
@@ -102,20 +100,16 @@ GraphicsBox {
     MetroButton {
       width: 120
       height: 35
-      text: Backend.translate("OK")
-      enabled: {
-        return JSON.parse(Backend.callLuaFunction(
-          "PoxiFeasible",
-          [root.poxi_type, root.selected_ids, root.card_data, root.extra_data]
-        ));
-      }
+      text: luatr("OK")
+      enabled: lcall("PoxiFeasible", root.poxi_type, root.selected_ids,
+                     root.card_data, root.extra_data);
       onClicked: root.cardsSelected(root.selected_ids)
     }
 
     MetroButton {
       width: 120
       height: 35
-      text: Backend.translate("Cancel")
+      text: luatr("Cancel")
       visible: root.cancelable
       onClicked: root.cardsSelected([])
     }
diff --git a/Fk/RoomElement/SkillArea.qml b/Fk/RoomElement/SkillArea.qml
index 6aa1f8b7..42c08542 100644
--- a/Fk/RoomElement/SkillArea.qml
+++ b/Fk/RoomElement/SkillArea.qml
@@ -112,10 +112,7 @@ Flickable {
       return false;
     };
 
-    const data = JSON.parse(Backend.callLuaFunction(
-      "GetSkillData",
-      [skill_name]
-    ));
+    const data = lcall("GetSkillData", skill_name);
 
     if (prelight) {
       if (!modelContains(prelight_skills, data))
diff --git a/Fk/RoomElement/UltSkillAnimation.qml b/Fk/RoomElement/UltSkillAnimation.qml
index 9c95489b..04c41fa3 100644
--- a/Fk/RoomElement/UltSkillAnimation.qml
+++ b/Fk/RoomElement/UltSkillAnimation.qml
@@ -28,12 +28,12 @@ Item {
       Text {
         text: {
           let o = "$" + skillName + "_" + generalName + (index % 2 + 1);
-          let p = Backend.translate(o);
+          let p = luatr(o);
           if (o !== p) {
             return p;
           }
           o = "$" + skillName + (index % 2 + 1);
-          p = Backend.translate(o);
+          p = luatr(o);
           if (o === p) {
             return "Ultimate Skill Invoked!";
           }
@@ -59,12 +59,12 @@ Item {
       Text {
         text: {
           let o = "$" + skillName + "_" + generalName + ((index + 1) % 2 + 1);
-          let p = Backend.translate(o);
+          let p = luatr(o);
           if (o !== p) {
             return p;
           }
           o = "$" + skillName + ((index + 1) % 2 + 1);
-          p = Backend.translate(o);
+          p = luatr(o);
           if (o === p) {
             return "Ultimate Skill Invoked!";
           }
@@ -90,7 +90,7 @@ Item {
   Text {
     topPadding: 5
     id: skill
-    text: Backend.translate(skillName)
+    text: luatr(skillName)
     font.family: fontLi2.name
     font.pixelSize: 40
     x: root.width / 2 + 100
diff --git a/Fk/RoomElement/ViewGeneralPile.qml b/Fk/RoomElement/ViewGeneralPile.qml
index 46645f41..36e1fd1e 100644
--- a/Fk/RoomElement/ViewGeneralPile.qml
+++ b/Fk/RoomElement/ViewGeneralPile.qml
@@ -13,7 +13,7 @@ ColumnLayout {
     Layout.fillWidth: true
     Layout.preferredHeight: childrenRect.height + 4
 
-    text: Backend.translate(extra_data.name)
+    text: luatr(extra_data.name)
   }
 
   GridView {
diff --git a/Fk/RoomElement/ViewPile.qml b/Fk/RoomElement/ViewPile.qml
index 4b0bb269..f44c8610 100644
--- a/Fk/RoomElement/ViewPile.qml
+++ b/Fk/RoomElement/ViewPile.qml
@@ -13,7 +13,7 @@ ColumnLayout {
     Layout.fillWidth: true
     Layout.preferredHeight: childrenRect.height + 4
 
-    text: Backend.translate(extra_data.name)
+    text: luatr(extra_data.name)
   }
 
   GridView {
@@ -32,7 +32,7 @@ ColumnLayout {
       Component.onCompleted: {
         let data = {}
         if (extra_data.ids) {
-          data = JSON.parse(Backend.callLuaFunction("GetCardData", [modelData]));
+          data = lcall("GetCardData", modelData);
         } else {
           data.cid = 0;
           data.name = modelData;
diff --git a/Fk/SkillInteraction/SkillCombo.qml b/Fk/SkillInteraction/SkillCombo.qml
index 97eb8c4a..ccf15719 100644
--- a/Fk/SkillInteraction/SkillCombo.qml
+++ b/Fk/SkillInteraction/SkillCombo.qml
@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 import QtQuick
+import Fk
 import Fk.Pages
 
 MetroButton {
@@ -12,34 +13,21 @@ MetroButton {
   property string answer: default_choice
   property bool detailed: false
 
-  function processPrompt(prompt) {
-    const data = prompt.split(":");
-    let raw = Backend.translate(data[0]);
-    const src = parseInt(data[1]);
-    const dest = parseInt(data[2]);
-    if (raw.match("%src")) raw = raw.replace(/%src/g, Backend.translate(getPhoto(src).general));
-    if (raw.match("%dest")) raw = raw.replace(/%dest/g, Backend.translate(getPhoto(dest).general));
-    if (raw.match("%arg2")) raw = raw.replace(/%arg2/g, Backend.translate(data[4]));
-    if (raw.match("%arg")) raw = raw.replace(/%arg/g, Backend.translate(data[3]));
-    return raw;
-  }
-
-  text: processPrompt(answer)
+  text: Util.processPrompt(answer)
 
   onAnswerChanged: {
     if (!answer) return;
-    Backend.callLuaFunction(
-      "SetInteractionDataOfSkill",
-      [skill, JSON.stringify(answer)]
-    );
+    lcall("SetInteractionDataOfSkill", skill, JSON.stringify(answer));
     roomScene.dashboard.startPending(skill);
   }
 
   onClicked: {
     if (detailed) {
-      roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/DetailedChoiceBox.qml");
+      roomScene.popupBox.sourceComponent =
+        Qt.createComponent("../RoomElement/DetailedChoiceBox.qml");
     } else {
-      roomScene.popupBox.sourceComponent = Qt.createComponent("../RoomElement/ChoiceBox.qml");
+      roomScene.popupBox.sourceComponent =
+        Qt.createComponent("../RoomElement/ChoiceBox.qml");
     }
     const box = roomScene.popupBox.item;
     box.options = choices;
diff --git a/Fk/SkillInteraction/SkillSpin.qml b/Fk/SkillInteraction/SkillSpin.qml
index a58368d9..924501fa 100644
--- a/Fk/SkillInteraction/SkillSpin.qml
+++ b/Fk/SkillInteraction/SkillSpin.qml
@@ -10,11 +10,7 @@ SpinBox {
   // from, to
 
   onValueChanged: {
-    Backend.callLuaFunction(
-      "SetInteractionDataOfSkill",
-      [skill, JSON.stringify(answer)]
-    );
+    lcall("SetInteractionDataOfSkill", skill, JSON.stringify(answer));
     roomScene.dashboard.startPending(skill);
   }
-
 }
diff --git a/Fk/Splash.qml b/Fk/Splash.qml
index 4d9cb736..c88370f5 100644
--- a/Fk/Splash.qml
+++ b/Fk/Splash.qml
@@ -89,8 +89,14 @@ Rectangle {
       id: textAni
       running: false
       loops: Animation.Infinite
-      NumberAnimation { from: 0; to: 1; duration: 1600; easing.type: Easing.InOutQuad; }
-      NumberAnimation { from: 1; to: 0; duration: 1600; easing.type: Easing.InOutQuad; }
+      NumberAnimation {
+        from: 0; to: 1; duration: 1600
+        easing.type: Easing.InOutQuad
+      }
+      NumberAnimation {
+        from: 1; to: 0; duration: 1600
+        easing.type: Easing.InOutQuad
+      }
     }
   }
 
diff --git a/Fk/Toast.qml b/Fk/Toast.qml
index e65ddb09..dee94a74 100644
--- a/Fk/Toast.qml
+++ b/Fk/Toast.qml
@@ -15,7 +15,8 @@ Rectangle {
   property real time: defaultTime
   readonly property real fadeTime: 300
 
-  anchors.horizontalCenter: parent != null ? parent.horizontalCenter : undefined
+  anchors.horizontalCenter: parent != null ? parent.horizontalCenter
+                                           : undefined
   height: message.height + 20
   width: message.width + 40
   radius: 16
diff --git a/Fk/ToastManager.qml b/Fk/ToastManager.qml
index 3649c42a..78bf6bd3 100644
--- a/Fk/ToastManager.qml
+++ b/Fk/ToastManager.qml
@@ -2,8 +2,8 @@
 
 import QtQuick
 
-// copy from https://gist.github.com/jonmcclung/bae669101d17b103e94790341301c129
-// and modified some code
+// https://gist.github.com/jonmcclung/bae669101d17b103e94790341301c129
+// modified some code
 ListView {
   function show(text, duration) {
     if (duration === undefined) {
diff --git a/Fk/main.qml b/Fk/main.qml
index 02b4f81b..75fe3c0b 100644
--- a/Fk/main.qml
+++ b/Fk/main.qml
@@ -45,7 +45,8 @@ Window {
     StackView {
       id: mainStack
       visible: !mainWindow.busy
-      // If error occurs during loading initialItem, the program will fall into "polish()" loop
+      // If error occurs during loading initialItem
+      //   the program will fall into "polish()" loop
       // initialItem: init
       anchors.fill: parent
     }
@@ -159,7 +160,10 @@ Window {
           return;
         }
         if (mainWindow.is_pending && command !== "ChangeSelf") {
-          mainWindow.pending_message.push({ command: command, jsonData: jsonData });
+          mainWindow.pending_message.push({
+                                            command: command,
+                                            jsonData: jsonData,
+                                          });
         } else {
           if (command === "StartChangeSelf") {
             mainWindow.is_pending = true;
@@ -254,4 +258,18 @@ Window {
       exitMessageDialog.open();
     }
   }
+
+  // fake global functions
+  function lcall(funcName, ...params) {
+    const ret = Backend.callLuaFunction(funcName, [...params]);
+    try {
+      return JSON.parse(ret);
+    } catch (e) {
+      return ret;
+    }
+  }
+
+  function luatr(src) {
+    return Backend.translate(src);
+  }
 }
diff --git a/Fk/qmldir b/Fk/qmldir
index 3a502eb2..452ae67b 100644
--- a/Fk/qmldir
+++ b/Fk/qmldir
@@ -1,3 +1,3 @@
 module Fk
 SkinBank 1.0 skin-bank.js
-Utility 1.0 util.js
+Util 1.0 util.js
diff --git a/Fk/skin-bank.js b/Fk/skin-bank.js
index 74c608d0..ca305c01 100644
--- a/Fk/skin-bank.js
+++ b/Fk/skin-bank.js
@@ -31,18 +31,20 @@ const searchPkgResource = function(path, name, suffix) {
 }
 
 function getGeneralExtraPic(name, extra) {
-  const data = JSON.parse(Backend.callLuaFunction("GetGeneralData", [name]));
+  const data = lcall("GetGeneralData", name);
   const extension = data.extension;
-  const path = AppPath + "/packages/" + extension + "/image/generals/" + extra + name + ".jpg";
+  const path = AppPath + "/packages/" + extension + "/image/generals/"
+             + extra + name + ".jpg";
   if (Backend.exists(path)) {
     return path;
   }
 }
 
 function getGeneralPicture(name) {
-  const data = JSON.parse(Backend.callLuaFunction("GetGeneralData", [name]));
+  const data = lcall("GetGeneralData", name);
   const extension = data.extension;
-  const path = AppPath + "/packages/" + extension + "/image/generals/" + name + ".jpg";
+  const path = AppPath + "/packages/" + extension + "/image/generals/"
+             + name + ".jpg";
   if (Backend.exists(path)) {
     return path;
   }
@@ -54,14 +56,15 @@ function getCardPicture(cidOrName) {
   let name = "unknown";
   if (typeof cidOrName === 'string') {
     name = cidOrName;
-    extension = Backend.callLuaFunction("GetCardExtensionByName", [cidOrName]);
+    extension = lcall("GetCardExtensionByName", cidOrName);
   } else {
-    const data = JSON.parse(Backend.callLuaFunction("GetCardData", [cid]));
+    const data = lcall("GetCardData", cid);
     extension = data.extension;
     name = data.name;
   }
 
-  let path = AppPath + "/packages/" + extension + "/image/card/" + name + ".png";
+  let path = AppPath + "/packages/" + extension + "/image/card/"
+           + name + ".png";
   if (Backend.exists(path)) {
     return path;
   } else {
@@ -72,9 +75,10 @@ function getCardPicture(cidOrName) {
 }
 
 function getDelayedTrickPicture(name) {
-  const extension = Backend.callLuaFunction("GetCardExtensionByName", [name]);
+  const extension = lcall("GetCardExtensionByName", name);
 
-  let path = AppPath + "/packages/" + extension + "/image/card/delayedTrick/" + name + ".png";
+  let path = AppPath + "/packages/" + extension + "/image/card/delayedTrick/"
+           + name + ".png";
   if (Backend.exists(path)) {
     return path;
   } else {
@@ -86,10 +90,11 @@ function getDelayedTrickPicture(name) {
 
 
 function getEquipIcon(cid, icon) {
-  const data = JSON.parse(Backend.callLuaFunction("GetCardData", [cid]));
+  const data = lcall("GetCardData", cid);
   const extension = data.extension;
   const name = icon || data.name;
-  let path = AppPath + "/packages/" + extension + "/image/card/equipIcon/" + name + ".png";
+  let path = AppPath + "/packages/" + extension + "/image/card/equipIcon/"
+           + name + ".png";
   if (Backend.exists(path)) {
     return path;
   } else {
diff --git a/Fk/util.js b/Fk/util.js
index 785d29d0..e7f53fa1 100644
--- a/Fk/util.js
+++ b/Fk/util.js
@@ -1,7 +1,5 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
-.pragma library
-
 function convertNumber(number) {
   if (number === 1)
     return "A";
@@ -14,8 +12,20 @@ function convertNumber(number) {
   return "";
 }
 
-Array.prototype.contains = function(element) {
-  return this.indexOf(element) != -1;
+function processPrompt(prompt) {
+  const data = prompt.split(":");
+  let raw = luatr(data[0]);
+  const src = parseInt(data[1]);
+  const dest = parseInt(data[2]);
+  if (raw.match("%src"))
+    raw = raw.replace(/%src/g, luatr(getPhoto(src).general));
+  if (raw.match("%dest"))
+    raw = raw.replace(/%dest/g, luatr(getPhoto(dest).general));
+  if (raw.match("%arg2"))
+    raw = raw.replace(/%arg2/g, luatr(data[4]));
+  if (raw.match("%arg"))
+    raw = raw.replace(/%arg/g, luatr(data[3]));
+  return raw;
 }
 
 Array.prototype.prepend = function() {
diff --git a/lua/client/client_util.lua b/lua/client/client_util.lua
index 55ae80dc..2baa02b6 100644
--- a/lua/client/client_util.lua
+++ b/lua/client/client_util.lua
@@ -127,6 +127,10 @@ function GetCardExtensionByName(cardName)
   return card and card.package.extensionName or ""
 end
 
+function GetAllMods()
+  return json.encode(Fk.extensions)
+end
+
 function GetAllGeneralPack()
   local ret = {}
   for _, name in ipairs(Fk.package_names) do
diff --git a/lua/core/card.lua b/lua/core/card.lua
index 71ec5e15..256dff7f 100644
--- a/lua/core/card.lua
+++ b/lua/core/card.lua
@@ -171,7 +171,7 @@ local function updateColorAndNumber(card)
   local different_color = false
   for i, id in ipairs(card.subcards) do
     local c = Fk:getCardById(id)
-    number = math.min(number + c.number, 13)
+    number = #card.subcards == 1 and math.min(number + c.number, 13) or 0
     if i == 1 then
       card.suit = c.suit
     else
diff --git a/lua/core/engine.lua b/lua/core/engine.lua
index c8d2a4f2..9b21d705 100644
--- a/lua/core/engine.lua
+++ b/lua/core/engine.lua
@@ -7,6 +7,7 @@
 --- 同时也提供了许多常用的函数。
 ---
 ---@class Engine : Object
+---@field public extensions table<string, string[]> @ 所有mod列表及其包含的拓展包
 ---@field public packages table<string, Package> @ 所有拓展包的列表
 ---@field public package_names string[] @ 含所有拓展包名字的数组，为了方便排序
 ---@field public skills table<string, Skill> @ 所有的技能
@@ -44,6 +45,11 @@ function Engine:initialize()
 
   Fk = self
 
+  self.extensions = {
+    ["standard"] = { "standard" },
+    ["standard_cards"] = { "standard_cards" },
+    ["maneuvering"] = { "maneuvering" },
+  }
   self.packages = {}    -- name --> Package
   self.package_names = {}
   self.skills = {}    -- name --> Skill
@@ -142,10 +148,13 @@ function Engine:loadPackages()
       -- so dont use type(pack) == "table" here
       if type(pack) == "table" then
         if pack[1] ~= nil then
+          self.extensions[dir] = {}
           for _, p in ipairs(pack) do
+            table.insert(self.extensions[dir], p.name)
             self:loadPackage(p)
           end
         else
+          self.extensions[dir] = { pack.name }
           self:loadPackage(pack)
         end
       end
diff --git a/lua/server/events/misc.lua b/lua/server/events/misc.lua
index 36128b8b..db18d589 100644
--- a/lua/server/events/misc.lua
+++ b/lua/server/events/misc.lua
@@ -128,9 +128,10 @@ end
 GameEvent.functions[GameEvent.ClearEvent] = function(self)
   local event = self.data[1]
   local logic = self.room.logic
-  event:clear_func()
+  -- 不可中断
+  Pcall(event.clear_func, event)
   for _, f in ipairs(event.extra_clear_funcs) do
-    if type(f) == "function" then f(event) end
+    if type(f) == "function" then Pcall(f, event) end
   end
 
   -- cleaner顺利执行完了，出栈吧
diff --git a/packages/test/qml/TestDialog.qml b/packages/test/qml/TestDialog.qml
index be4ad3e6..e377da40 100644
--- a/packages/test/qml/TestDialog.qml
+++ b/packages/test/qml/TestDialog.qml
@@ -16,7 +16,7 @@ ColumnLayout {
     Layout.fillWidth: true
     Layout.preferredHeight: childrenRect.height + 4
 
-    text: Backend.translate(extra_data.name)
+    text: luatr(extra_data.name)
   }
 
   PathView {
diff --git a/src/core/packman.cpp b/src/core/packman.cpp
index a98d7ea8..dead59c2 100644
--- a/src/core/packman.cpp
+++ b/src/core/packman.cpp
@@ -393,7 +393,7 @@ clean:
 int PackMan::status(const QString &name) {
   git_repository *repo = NULL;
   int error;
-  git_status_list *status_list;
+  git_status_list *status_list = NULL;
   size_t i, maxi;
   const git_status_entry *s;
   auto path = QString("packages/%1").arg(name).toUtf8();