add translation for toc.js

src/public/app/widgets/toc.js

@@ -13,7 +13,7 @@
  * to the wrong heading (although what "right" means in those cases is not
  * clear), but it won't crash.
  */
-
+import { t } from "../services/i18n.js";
 import attributeService from "../services/attributes.js";
 import RightPanelWidget from "./right_panel_widget.js";
 import options from "../services/options.js";
@@ -55,14 +55,14 @@ const TPL = `<div class="toc-widget">
 
 export default class TocWidget extends RightPanelWidget {
     get widgetTitle() {
-        return "Table of Contents";
+        return t("toc.table_of_contents");
     }
 
     get widgetButtons() {
         return [
             new OnClickButtonWidget()
                 .icon("bx-cog")
-                .title("Options")
+                .title(t("toc.options"))
                 .titlePlacement("left")
                 .onClick(() => appContext.tabManager.openContextWithNote('_optionsTextNotes', {activate: true}))
                 .class("icon-action"),

src/public/translations/cn/translation.json

@@ -1410,5 +1410,9 @@
     "close_all_tabs": "关闭所有标签页",
     "move_tab_to_new_window": "将此标签页移动到新窗口",
     "new_tab": "新标签页"
+  },
+  "toc": {
+    "table_of_contents": "目录",
+    "options": "选项"
   }
 }

src/public/translations/en/translation.json

@@ -1410,5 +1410,9 @@
     "close_all_tabs": "Close all tabs",
     "move_tab_to_new_window": "Move this tab to a new window",
     "new_tab": "New tab"
+  },
+  "toc": {
+    "table_of_contents": "Table of Contents",
+    "options": "Options"
   }
 }