Task/widen input types in account balances component

Widen input types in account balances component

Part of #7393

libs/ui/src/lib/account-balances/account-balances.component.ts

@@ -69,11 +69,13 @@ export class GfAccountBalancesComponent implements OnChanges, OnInit {
 
   public readonly accountBalances =
     input.required<AccountBalancesResponse['balances']>();
-  public readonly accountCurrency = input.required<string>();
+  public readonly accountCurrency = input.required<string | null>();
   public readonly accountId = input.required<string>();
   public readonly currentBalance = input<number | null>();
   public readonly displayedColumns: string[] = ['date', 'value', 'actions'];
-  public readonly locale = input(getLocale());
+  public readonly locale = input(getLocale(), {
+    transform: (value?: string) => value ?? getLocale()
+  });
   public readonly showActions = input(true);
   public readonly sort = viewChild(MatSort);