6 files declare their use of ContentTranslationManagerInterface in Drupal 8

ContentTranslationContextualLinks.php in core/modules/content_translation/src/Plugin/Derivative/ContentTranslationContextualLinks.php

ContentTranslationController.php in core/modules/content_translation/src/Controller/ContentTranslationController.php

ContentTranslationDeleteAccess.php in core/modules/content_translation/src/Access/ContentTranslationDeleteAccess.php

ContentTranslationLocalTasks.php in core/modules/content_translation/src/Plugin/Derivative/ContentTranslationLocalTasks.php

ContentTranslationRouteSubscriber.php in core/modules/content_translation/src/Routing/ContentTranslationRouteSubscriber.php

ContentTranslationSynchronizedFieldsConstraintValidator.php in core/modules/content_translation/src/Plugin/Validation/Constraint/ContentTranslationSynchronizedFieldsConstraintValidator.php