feat(client): implement defaultLocale to resolve type error

apps/client/src/app/components/home-watchlist/home-watchlist.component.ts

@@ -1,5 +1,6 @@
 import { ImpersonationStorageService } from '@ghostfolio/client/services/impersonation-storage.service';
 import { UserService } from '@ghostfolio/client/services/user/user.service';
+import { locale as defaultLocale } from '@ghostfolio/common/config';
 import {
   AssetProfileIdentifier,
   Benchmark,
@@ -149,7 +150,7 @@ export class GfHomeWatchlistComponent implements OnInit {
           autoFocus: false,
           data: {
             deviceType: this.deviceType,
-            locale: this.user?.settings?.locale
+            locale: this.user?.settings?.locale ?? defaultLocale
           },
           width: this.deviceType === 'mobile' ? '100vw' : '50rem'
         });