add i18n feat && Add partial translation

src/main.jsx

@@ -4,6 +4,9 @@ import App from './App.jsx'
 import './index.css'
 import 'katex/dist/katex.min.css'
 
+// Initialize i18n
+import './i18n/config.js'
+
 // Clean up stale service workers on app load to prevent caching issues after builds
 if ('serviceWorker' in navigator) {
   navigator.serviceWorker.getRegistrations().then(registrations => {