All classes that implement EntityTypeRepositoryInterface in Drupal 8
- class \Drupal\Core\Entity\EntityManager implements \Symfony\Component\DependencyInjection\ContainerAwareInterface, EntityManagerInterface uses \Symfony\Component\DependencyInjection\ContainerAwareTrait
- class \Drupal\Core\Entity\EntityTypeRepository implements EntityTypeRepositoryInterface uses StringTranslationTrait