refactor: reconstruct language files into multi-file structures (#4683)

* refactor: reconstruct language files into multi-file structures

* chore: typo

playground/src/locales/langs/en-US/demos.json

@@ -0,0 +1,69 @@
+{
+  "title": "Demos",
+  "access": {
+    "frontendPermissions": "Frontend Permissions",
+    "backendPermissions": "Backend Permissions",
+    "pageAccess": "Page Access",
+    "buttonControl": "Button Control",
+    "menuVisible403": "Menu Visible(403)",
+    "superVisible": "Visible to Super",
+    "adminVisible": "Visible to Admin",
+    "userVisible": "Visible to User"
+  },
+  "nested": {
+    "title": "Nested Menu",
+    "menu1": "Menu 1",
+    "menu2": "Menu 2",
+    "menu2_1": "Menu 2-1",
+    "menu3": "Menu 3",
+    "menu3_1": "Menu 3-1",
+    "menu3_2": "Menu 3-2",
+    "menu3_2_1": "Menu 3-2-1"
+  },
+  "outside": {
+    "title": "External Pages",
+    "embedded": "Embedded",
+    "externalLink": "External Link"
+  },
+  "badge": {
+    "title": "Menu Badge",
+    "dot": "Dot Badge",
+    "text": "Text Badge",
+    "color": "Badge Color"
+  },
+  "activeIcon": {
+    "title": "Active Menu Icon",
+    "children": "Children Active Icon"
+  },
+  "fallback": {
+    "title": "Fallback Page"
+  },
+  "features": {
+    "title": "Features",
+    "hideChildrenInMenu": "Hide Menu Children",
+    "loginExpired": "Login Expired",
+    "icons": "Icons",
+    "watermark": "Watermark",
+    "tabs": "Tabs",
+    "tabDetail": "Tab Detail Page",
+    "fullScreen": {
+      "title": "FullScreen"
+    },
+    "clipboard": "Clipboard"
+  },
+  "breadcrumb": {
+    "navigation": "Breadcrumb Navigation",
+    "lateral": "Lateral Mode",
+    "lateralDetail": "Lateral Mode Detail",
+    "level": "Level Mode",
+    "levelDetail": "Level Mode Detail"
+  },
+  "vben": {
+    "title": "Project",
+    "about": "About",
+    "document": "Document",
+    "antdv": "Ant Design Vue Version",
+    "naive-ui": "Naive UI Version",
+    "element-plus": "Element Plus Version"
+  }
+}