ContentTranslationHandler::entityFormSubmit

ContentTranslationHandler::entityFormSubmit($form, FormStateInterface $form_state)

function entityFormSubmit($form, FormStateInterface $form_state) {
  /** @var \Drupal\Core\Entity\ContentEntityFormInterface $form_object */
  $form_object = $form_state->getFormObject();
  /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
  $entity = $form_object->getEntity();

  // ContentEntityForm::submit will update the changed timestamp on submit
  // after the entity has been validated, so that it does not break the
  // EntityChanged constraint validator. The content translation metadata
  // field for the changed timestamp  does not have such a constraint defined
  // at the moment, but it is correct to update it's value in a submission
  // handler as well and have the same logic like in the Form API.
  if ($entity->hasField('content_translation_changed')) {
    $metadata = $this->manager->getTranslationMetadata($entity);
    $metadata->setChangedTime(REQUEST_TIME);
  }
}