ContentTranslationController::prepareTranslation

public ContentTranslationController::prepareTranslation(ContentEntityInterface $entity, LanguageInterface $source, LanguageInterface $target)

public function prepareTranslation(ContentEntityInterface $entity, LanguageInterface $source, LanguageInterface $target) {
  /* @var \Drupal\Core\Entity\ContentEntityInterface $source_translation */
  $source_translation = $entity->getTranslation($source->getId());
  $target_translation = $entity->addTranslation($target->getId(), $source_translation->toArray());

  // Make sure we do not inherit the affected status from the source values.
  if ($entity->getEntityType()->isRevisionable()) {
    $target_translation->setRevisionTranslationAffected(NULL);
  }

  /** @var \Drupal\user\UserInterface $user */
  $user = $this->entityManager()->getStorage('user')->load($this->currentUser()->id());
  $metadata = $this->manager->getTranslationMetadata($target_translation);

  // Update the translation author to current user, as well the translation
  // creation time.
  $metadata->setAuthor($user);
  $metadata->setCreatedTime(REQUEST_TIME);
}