window and help translations for menu

src/locales/en/messages.json

@@ -951,5 +951,11 @@
         "example": "Password"
       }
     }
+  },
+  "help": {
+    "message": "Help"
+  },
+  "window": {
+    "message": "Window"
   }
 }

src/main/menu.main.ts

@@ -371,6 +371,7 @@ export class MenuMain {
                 ],
             },
             {
+                label: this.main.i18nService.t('window'),
                 role: 'window',
                 submenu: [
                     {
@@ -384,6 +385,7 @@ export class MenuMain {
                 ],
             },
             {
+                label: this.main.i18nService.t('help'),
                 role: 'help',
                 submenu: [
                     {