feat: Implement internationalization with react-i18next, add translation files, and integrate language switching across components.

k-notes-frontend/src/main.tsx

@@ -1,10 +1,12 @@
 import { StrictMode } from 'react'
 import { createRoot } from 'react-dom/client'
 import './index.css'
+import '../i18n';
 import App from './App.tsx'
 import { Providers } from "@/components/providers";
 import { Toaster } from "@/components/ui/sonner";
 
+
 createRoot(document.getElementById('root')!).render(
   <StrictMode>
     <Providers>