Improve the UI and tests

frontend/src/i18n/index.ts

@@ -1,6 +1,7 @@
 // frontend/src/i18n/index.ts
 import i18n from 'i18next';
 import { initReactI18next } from 'react-i18next';
+import ICU from 'i18next-icu';
 import { resources, defaultLanguage, supportedLanguages } from '../locales';
 
 // Get saved language from localStorage or default
@@ -24,6 +25,7 @@ const getSavedLanguage = () => {
 const initialLanguage = getSavedLanguage();
 
 i18n
+  .use(ICU)
   .use(initReactI18next)
   .init({
     resources,