class NodeTranslationHandler

class NodeTranslationHandler extends ContentTranslationHandler {
    
    /**
     * {@inheritdoc}
     */
    public function entityFormAlter(array &$form, FormStateInterface $form_state, EntityInterface $entity) {
        parent::entityFormAlter($form, $form_state, $entity);
        if (isset($form['content_translation'])) {
            // We do not need to show these values on node forms: they inherit the
            // basic node property values.
            $form['content_translation']['status']['#access'] = FALSE;
            $form['content_translation']['name']['#access'] = FALSE;
            $form['content_translation']['created']['#access'] = FALSE;
        }
        $form_object = $form_state->getFormObject();
        $form_langcode = $form_object->getFormLangcode($form_state);
        $translations = $entity->getTranslationLanguages();
        $status_translatable = NULL;
        // Change the submit button labels if there was a status field they affect
        // in which case their publishing / unpublishing may or may not apply
        // to all translations.
        if (!$entity->isNew() && (!isset($translations[$form_langcode]) || count($translations) > 1)) {
            foreach ($entity->getFieldDefinitions() as $property_name => $definition) {
                if ($property_name == 'status') {
                    $status_translatable = $definition->isTranslatable();
                }
            }
            if (isset($status_translatable)) {
                if (isset($form['actions']['submit'])) {
                    $form['actions']['submit']['#value'] .= ' ' . ($status_translatable ? t('(this translation)') : t('(all translations)'));
                }
            }
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function entityFormTitle(EntityInterface $entity) {
        $type_name = node_get_type_label($entity);
        return t('<em>Edit @type</em> @title', [
            '@type' => $type_name,
            '@title' => $entity->label(),
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function entityFormEntityBuild($entity_type, EntityInterface $entity, array $form, FormStateInterface $form_state) {
        if ($form_state->hasValue('content_translation')) {
            $translation =& $form_state->getValue('content_translation');
            $translation['status'] = $entity->isPublished();
            $account = $entity->uid->entity;
            $translation['uid'] = $account ? $account->id() : 0;
            $translation['created'] = $this->dateFormatter
                ->format($entity->created->value, 'custom', 'Y-m-d H:i:s O');
        }
        parent::entityFormEntityBuild($entity_type, $entity, $form, $form_state);
    }

}