add translation for buttons: close pane button

src/public/app/widgets/buttons/close_pane_button.js

@@ -1,3 +1,4 @@
+import { t } from "../../services/i18n.js";
 import OnClickButtonWidget from "./onclick_button.js";
 
 export default class ClosePaneButton extends OnClickButtonWidget {
@@ -15,7 +16,7 @@ export default class ClosePaneButton extends OnClickButtonWidget {
         super();
 
         this.icon("bx-x")
-            .title("Close this pane")
+            .title(t("close_pane_button.close_this_pane"))
             .titlePlacement("bottom")
             .onClick((widget, e) => {
                 // to avoid split pane container detecting click within the pane which would try to activate this

src/public/translations/cn/translation.json

@@ -549,5 +549,8 @@
         "october": "十月",
         "november": "十一月",
         "december": "十二月"
+    },
+    "close_pane_button": {
+        "close_this_pane": "关闭此面板"
     }
 }

src/public/translations/en/translation.json

@@ -550,5 +550,8 @@
         "october": "October",
         "november": "November",
         "december": "December"
+    },
+    "close_pane_button": {
+        "close_this_pane": "Close this pane"
     }
 }