feat(workbench): add merged main menu style (#561)

* feat(workbench): add merged main menu style

* fix(workbench): restore focus on a second Alt and keep closed menus closed

src/platform/locales/text/zh.json

@@ -2190,6 +2190,9 @@
   "TypeScript version": "TypeScript 版本",
   "Types": "类型",
   "Typography Settings": "排版设置",
+  "Main menu": "主菜单",
+  "Hamburger button": "汉堡菜单按钮",
+  "Merged with main toolbar": "与主工具栏合并",
   "UI Options": "UI 选项",
   "UI elements take up less screen space": "UI 元素占用更少的屏幕空间",
   "UI font": "UI 字体",