old_contents: export default function () {
    this.passthrough('/translations/**');
  
    this.get('/api/locale', { locale: 'en' });
  }
  
new_contents: export default function () {
    this.passthrough('/translations/**');
  
    this.get('/api/locale', { locale: 'en' });
  
    this.get('/api/notifications', { events: [] });
  }
  
subject: Add basic `GET /api/notifications` route handler