class ContentEntityDeleteForm

class ContentEntityDeleteForm extends ContentEntityConfirmFormBase {
    use EntityDeleteFormTrait {
        getQuestion as traitGetQuestion;
        logDeletionMessage as traitLogDeletionMessage;
        getDeletionMessage as traitGetDeletionMessage;
        getCancelUrl as traitGetCancelUrl;
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state) {
        $form = parent::buildForm($form, $form_state);
        
        /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
        $entity = $this->getEntity();
        if ($entity->isDefaultTranslation()) {
            if (count($entity->getTranslationLanguages()) > 1) {
                $languages = [];
                foreach ($entity->getTranslationLanguages() as $language) {
                    $languages[] = $language->getName();
                }
                $form['deleted_translations'] = [
                    '#theme' => 'item_list',
                    '#title' => $this->t('The following @entity-type translations will be deleted:', [
                        '@entity-type' => $entity->getEntityType()
                            ->getSingularLabel(),
                    ]),
                    '#items' => $languages,
                ];
                $form['actions']['submit']['#value'] = $this->t('Delete all translations');
            }
        }
        else {
            $form['actions']['submit']['#value'] = $this->t('Delete @language translation', [
                '@language' => $entity->language()
                    ->getName(),
            ]);
        }
        return $form;
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        
        /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
        $entity = $this->getEntity();
        $message = $this->getDeletionMessage();
        // Make sure that deleting a translation does not delete the whole entity.
        if (!$entity->isDefaultTranslation()) {
            $untranslated_entity = $entity->getUntranslated();
            $untranslated_entity->removeTranslation($entity->language()
                ->getId());
            $untranslated_entity->save();
            $form_state->setRedirectUrl($untranslated_entity->toUrl('canonical'));
        }
        else {
            $entity->delete();
            $form_state->setRedirectUrl($this->getRedirectUrl());
        }
        $this->messenger()
            ->addStatus($message);
        $this->logDeletionMessage();
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCancelUrl() {
        
        /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
        $entity = $this->getEntity();
        return $entity->isDefaultTranslation() ? $this->traitGetCancelUrl() : $entity->toUrl('canonical');
    }
    
    /**
     * {@inheritdoc}
     */
    protected function getDeletionMessage() {
        
        /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
        $entity = $this->getEntity();
        if (!$entity->isDefaultTranslation()) {
            return $this->t('The @entity-type %label @language translation has been deleted.', [
                '@entity-type' => $entity->getEntityType()
                    ->getSingularLabel(),
                '%label' => $entity->label(),
                '@language' => $entity->language()
                    ->getName(),
            ]);
        }
        return $this->traitGetDeletionMessage();
    }
    
    /**
     * {@inheritdoc}
     */
    protected function logDeletionMessage() {
        
        /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
        $entity = $this->getEntity();
        if (!$entity->isDefaultTranslation()) {
            $this->logger($entity->getEntityType()
                ->getProvider())
                ->notice('The @entity-type %label @language translation has been deleted.', [
                '@entity-type' => $entity->getEntityType()
                    ->getSingularLabel(),
                '%label' => $entity->label(),
                '@language' => $entity->language()
                    ->getName(),
            ]);
        }
        else {
            $this->traitLogDeletionMessage();
        }
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQuestion() {
        
        /** @var \Drupal\Core\Entity\ContentEntityInterface $entity */
        $entity = $this->getEntity();
        if (!$entity->isDefaultTranslation()) {
            return $this->t('Are you sure you want to delete the @language translation of the @entity-type %label?', [
                '@language' => $entity->language()
                    ->getName(),
                '@entity-type' => $this->getEntity()
                    ->getEntityType()
                    ->getSingularLabel(),
                '%label' => $this->getEntity()
                    ->label(),
            ]);
        }
        return $this->traitGetQuestion();
    }

}