Add missing admin addon translations and fix event name rendering

resources/js/admin/mobile/__tests__/EventAddonsPage.test.tsx

@@ -7,7 +7,7 @@ const navigateMock = vi.fn();
 const fixtures = vi.hoisted(() => ({
   event: {
     id: 42,
-    name: 'Demo Event',
+    name: { de: 'Demo Event DE', en: 'Demo Event EN' },
     slug: 'demo-event',
     status: 'published',
     event_date: '2026-02-01T12:00:00Z',
@@ -165,6 +165,7 @@ describe('MobileEventAddonsPage', () => {
   it('renders add-ons and event-specific purchase history', async () => {
     render(<MobileEventAddonsPage />);
 
+    expect(await screen.findByText('Demo Event DE')).toBeInTheDocument();
     expect((await screen.findAllByText('Extend gallery 30 days')).length).toBeGreaterThan(0);
     expect(screen.getByText('Extra photos 500')).toBeInTheDocument();
     expect(screen.getByText('Purchased add-ons for this event')).toBeInTheDocument();