Saving option to local storage (bug)

This way, even when the page is refreshed, it will:

>First check localStorage for a saved language
>If found, use that language
>If not found, save the current language (or 'en' as fallback) to localStorage

This ensures the language preference persists across page refreshes.

template/app/src/client/components/LanguageSelector.tsx

@@ -11,7 +11,14 @@ interface LanguageSelectorProps {
 export default function LanguageSelector({ isLandingPage, className }: LanguageSelectorProps) {
   const { i18n } = useTranslation();
 
+  // Initialize language from localStorage or default to 'en'
+  React.useEffect(() => {
+    const savedLanguage = localStorage.getItem('language') || 'en';
+    i18n.changeLanguage(savedLanguage);
+  }, [i18n]);
+
   const changeLanguage = (lng: string) => {
+    localStorage.setItem('language', lng);
     i18n.changeLanguage(lng);
   };