TranslateEditForm::validateForm

public TranslateEditForm::validateForm(array &$form, FormStateInterface $form_state)

public function validateForm(array &$form, FormStateInterface $form_state) {
  $langcode = $form_state->getValue('langcode');
  foreach ($form_state->getValue('strings') as $lid => $translations) {
    foreach ($translations['translations'] as $key => $value) {
      if (!locale_string_is_safe($value)) {
        $form_state->setErrorByName("strings][$lid][translations][$key", $this->t('The submitted string contains disallowed HTML: %string', array('%string' => $value)));
        $form_state->setErrorByName("translations][$langcode][$key", $this->t('The submitted string contains disallowed HTML: %string', array('%string' => $value)));
        $this->logger('locale')->warning('Attempted submission of a translation string with disallowed HTML: %string', array('%string' => $value));
      }
    }
  }
}