feat(i18n): add internationalization support with i18next

- Add i18next and related dependencies for translation support
- Create locale files for English and Farsi languages
- Implement i18n configuration and provider in layout
- Set up route factory and constants for internationalized routes
- Remove test button components and simplify main page

package.json

@@ -9,9 +9,13 @@
     "lint": "next lint"
   },
   "dependencies": {
+    "i18next": "^25.2.1",
+    "i18next-browser-languagedetector": "^8.1.0",
+    "i18next-http-backend": "^3.0.2",
     "next": "15.3.3",
     "react": "^19.0.0",
-    "react-dom": "^19.0.0"
+    "react-dom": "^19.0.0",
+    "react-i18next": "^15.5.2"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3",