Added the foundation for making the frontend multilingual. Now only need to import useTranslation and use t('key') for all user-facing text for all pages (+add key:value pairs in src/locales for each language ofc)

- package.json -> Imported packages i18next & react-i18next for multilingual functionality.
- src/App.jsx -> Imported LanguageSwitcher from ./components/LanguageSwitcher and added <LanguageSwitcher /> component at the beginning of layout so it's always visible.
- src/components/LanguageSwitcher.jsx -> LanguageSwitcher component, consists of a dropdown menu that always appears at top right corner for choosing language.
- src/i18n.js -> Initialize and configure i18next for app-wide multilingual support.
- src/locales/en.json + src/locales/fr.json -> Empty json files that will soon contain translation key:value pairs for each page.
- src/main.jsx -> Imported src/i18n.js for multilingual functionality.

Frontend/package.json

@@ -13,10 +13,12 @@
     "@reduxjs/toolkit": "^2.6.0",
     "@tailwindcss/vite": "^4.0.9",
     "axios": "^1.8.4",
+    "i18next": "^25.2.1",
     "lucide-react": "^0.476.0",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",
     "react-hot-toast": "^2.5.2",
+    "react-i18next": "^15.5.3",
     "react-icons": "^5.5.0",
     "react-redux": "^9.2.0",
     "react-router-dom": "^7.2.0"