frontend/src/app/app.config.ts

@@ -60,7 +60,7 @@ export const appConfig: ApplicationConfig = {
     ),
     importProvidersFrom(
       TranslateModule.forRoot({
-        defaultLanguage: 'it',
+        fallbackLang: 'it',
         loader: {
           provide: TranslateLoader,
           useClass: StaticTranslateLoader,
@@ -75,7 +75,7 @@ export const appConfig: ApplicationConfig = {
       } | null;
 
       translate.addLangs([...SUPPORTED_LANGS]);
-      translate.setDefaultLang('it');
+      translate.setFallbackLang('it');
       const requestedUrl =
         (typeof request?.url === 'string' && request.url) || router.url || '/';
       const lang = resolveLangFromUrl(requestedUrl);

frontend/src/app/core/services/language.service.spec.ts

@@ -9,7 +9,7 @@ describe('LanguageService', () => {
     const translate = {
       currentLang: '',
       addLangs: jasmine.createSpy('addLangs'),
-      setDefaultLang: jasmine.createSpy('setDefaultLang'),
+      setFallbackLang: jasmine.createSpy('setFallbackLang'),
       use: jasmine.createSpy('use').and.callFake((lang: string) => {
         translate.currentLang = lang;
         onLangChange.next({ lang });
@@ -75,6 +75,7 @@ describe('LanguageService', () => {
     const service = new LanguageService(translate, router);
 
     expect(translate.use).toHaveBeenCalledWith('it');
+    expect((translate as any).setFallbackLang).toHaveBeenCalledWith('it');
     expect(navigateSpy).toHaveBeenCalledTimes(1);
 
     const firstCall = navigateSpy.calls.mostRecent();

frontend/src/app/core/services/language.service.ts

@@ -24,7 +24,7 @@ export class LanguageService {
     private router: Router,
   ) {
     this.translate.addLangs(this.supportedLangs);
-    this.translate.setDefaultLang('it');
+    this.translate.setFallbackLang('it');
     this.translate.onLangChange.subscribe((event) => {
       const lang =
         typeof event.lang === 'string' ? event.lang.toLowerCase() : null;