content_translation_form_language_content_settings_validate

content_translation_form_language_content_settings_validate(array $form, FormStateInterface $form_state)

function content_translation_form_language_content_settings_validate(array $form, FormStateInterface $form_state) {
  $settings = &$form_state->getValue('settings');
  foreach ($settings as $entity_type => $entity_settings) {
    foreach ($entity_settings as $bundle => $bundle_settings) {
      if (!empty($bundle_settings['translatable'])) {
        $name = "settings][$entity_type][$bundle][translatable";

        $translatable_fields = isset($settings[$entity_type][$bundle]['fields']) ? array_filter($settings[$entity_type][$bundle]['fields']) : FALSE;
        if (empty($translatable_fields)) {
          $t_args = array('%bundle' => $form['settings'][$entity_type][$bundle]['settings']['#label']);
          $form_state->setErrorByName($name, t('At least one field needs to be translatable to enable %bundle for translation.', $t_args));
        }

        $values = $bundle_settings['settings']['language'];
        if (empty($values['language_alterable']) && \Drupal::languageManager()->isLanguageLocked($values['langcode'])) {
          foreach (\Drupal::languageManager()->getLanguages(LanguageInterface::STATE_LOCKED) as $language) {
            $locked_languages[] = $language->getName();
          }
          $form_state->setErrorByName($name, t('Translation is not supported if language is always one of: @locked_languages', array('@locked_languages' => implode(', ', $locked_languages))));
        }
      }
    }
  }
}