6 files declare their use of ContentTranslationHandler in Drupal 10

BlockContentTranslationHandler.php in core/modules/block_content/src/BlockContentTranslationHandler.php

CommentTranslationHandler.php in core/modules/comment/src/CommentTranslationHandler.php

MediaTranslationTest.php in core/modules/media/tests/src/Kernel/MediaTranslationTest.php

NodeTranslationHandler.php in core/modules/node/src/NodeTranslationHandler.php

ProfileTranslationHandler.php in core/modules/user/src/ProfileTranslationHandler.php

TermTranslationHandler.php in core/modules/taxonomy/src/TermTranslationHandler.php