All classes that implement EntityTranslationControllerInterface

class \Drupal\comment\CommentTranslationController
class \Drupal\entity_test\EntityTestTranslationController
class \Drupal\node\NodeTranslationController
class \Drupal\taxonomy\TermTranslationController
class \Drupal\translation_entity\EntityTranslationController implements EntityTranslationControllerInterface
class \Drupal\user\ProfileTranslationController