How to override prepareTranslation method in Drupal\content_translation\Controller in drupal 8? I want to override prepareTranslation method using my custom module in drupal 8. You can find this function here(Drupal\core\modules\content_translation\src\Controller\ContentTranslationController.php).
You can use hook_entity_prepare_form() to override the values from prepareTranslation() on $form_state.