fix: language detection

src/main/webapp/src/config/i18n.js

@@ -8,6 +8,16 @@ const vite_url = import.meta.env.VITE_URL;
 const options = {
     order: ['querystring', 'cookie', 'localStorage', 'sessionStorage', 'navigator', 'htmlTag'],
     caches: [],
+    convertDetectedLanguage: (lng) => {
+        const supportedLngs = ['en', 'fr'];
+        const languagePart = lng.split('-')[0];
+
+        if (supportedLngs.includes(languagePart)) {
+            return languagePart; // Manually return 'en' from 'en-US'
+        }
+
+        return lng;
+    },
 }
 
 i18n
@@ -22,8 +32,12 @@ i18n
     // init i18next
     // for all options read: https://www.i18next.com/overview/configuration-options
     .init({
+        fallbackLng: {
+            'fr-FR': ['fr'],
+            default: ['en']
+        },
         supportedLngs: ['fr', 'en'],
-        fallbackLng: 'fr',
+        nonExplicitSupportedLngs: true,
         debug: vite_url.startsWith('http://localhost'),
         interpolation: {
             escapeValue: false, // not needed for react as it escapes by default