Localize default account name created during user registration

apps/api/src/app/user/user.controller.ts

@@ -161,7 +161,7 @@ export class UserController {
 
     const { accessToken, id, role } = await this.userService.createUser({
       data: {},
-      languageCode: data?.languageCode
+      languageCode: data.languageCode
     });
 
     return {

apps/api/src/app/user/user.service.ts

@@ -716,8 +716,8 @@ export class UserService {
           create: {
             currency: DEFAULT_CURRENCY,
             name: this.i18nService.getTranslation({
-              languageCode: getSupportedLanguageCode(languageCode),
-              id: 'myAccount'
+              id: 'myAccount',
+              languageCode: getSupportedLanguageCode(languageCode)
             })
           }
         },

apps/api/src/helper/language.helper.spec.ts

@@ -24,8 +24,17 @@ describe('getSupportedLanguageCode', () => {
     expect(getSupportedLanguageCode('de')).toEqual('de');
   });
 
+  it('should ignore the region subtag', () => {
+    expect(getSupportedLanguageCode('de-CH')).toEqual('de');
+  });
+
+  it('should ignore the case', () => {
+    expect(getSupportedLanguageCode('DE')).toEqual('de');
+  });
+
   it('should use the default language code if the language is not supported', () => {
     expect(getSupportedLanguageCode()).toEqual(DEFAULT_LANGUAGE_CODE);
+    expect(getSupportedLanguageCode('')).toEqual(DEFAULT_LANGUAGE_CODE);
     expect(getSupportedLanguageCode('xx')).toEqual(DEFAULT_LANGUAGE_CODE);
   });
 });

apps/api/src/helper/language.helper.ts

@@ -3,14 +3,22 @@ import {
   SUPPORTED_LANGUAGE_CODES
 } from '@ghostfolio/common/config';
 
-export function getLanguageCodeFromHeader(acceptLanguage?: string): string {
-  const languageCode = acceptLanguage?.split(',')[0].split('-')[0];
+type SupportedLanguageCode = (typeof SUPPORTED_LANGUAGE_CODES)[number];
 
-  return getSupportedLanguageCode(languageCode);
+export function getLanguageCodeFromHeader(
+  acceptLanguage?: string
+): SupportedLanguageCode {
+  return getSupportedLanguageCode(acceptLanguage?.split(',')[0]);
 }
 
-export function getSupportedLanguageCode(languageCode?: string): string {
-  return (SUPPORTED_LANGUAGE_CODES as readonly string[]).includes(languageCode)
-    ? languageCode
+export function getSupportedLanguageCode(
+  languageCode?: string
+): SupportedLanguageCode {
+  const languageCodeToUse = languageCode
+    ?.split('-')[0]
+    .toLowerCase() as SupportedLanguageCode;
+
+  return SUPPORTED_LANGUAGE_CODES.includes(languageCodeToUse)
+    ? languageCodeToUse
     : DEFAULT_LANGUAGE_CODE;
 }