feat: Add i18n with 7 languages (DE, EN, ES, FR, AR, RU, PL)

- Added vue-i18n with language switcher in header
- Flag icons with language codes dropdown
- RTL support for Arabic
- Translated all navigation, auth, and module labels
- Language preference saved to localStorage

node_modules/@intlify/shared/README.md

@@ -0,0 +1,18 @@
+# @intlify/shared
+
+The shared utility package for intlify project
+
+## Forks
+The implementation of this module is contains code forked from other packages or projects:
+
+- [@vue/shared](https://github.com/vuejs/vue-next/tree/master/packages/shared)
+  - Useful Utilities at `utils.ts`
+    - Author: Evan You
+    - License: MIT
+  - Event Emitter at `emitter.ts` and `emittable.ts`
+    - Author: Jason Miller
+    - License: MIT
+
+## :copyright: License
+
+[MIT](http://opensource.org/licenses/MIT)