class NegotiationBrowserDeleteForm

class NegotiationBrowserDeleteForm extends ConfirmFormBase {
  use ConfigFormBaseTrait;

  /**
   * The browser language code to be deleted.
   *
   * @var string
   */
  protected $browserLangcode;

  /**
   * {@inheritdoc}
   */
  protected function getEditableConfigNames() {
    return [
      'language.mappings',
    ];
  }

  /**
   * {@inheritdoc}
   */
  public function getQuestion() {
    return $this
      ->t('Are you sure you want to delete %browser_langcode?', [
      '%browser_langcode' => $this->browserLangcode,
    ]);
  }

  /**
   * {@inheritdoc}
   */
  public function getCancelUrl() {
    return new Url('language.negotiation_browser');
  }

  /**
   * {@inheritdoc}
   */
  public function getFormId() {
    return 'language_negotiation_configure_browser_delete_form';
  }

  /**
   * {@inheritdoc}
   */
  public function buildForm(array $form, FormStateInterface $form_state, $browser_langcode = NULL) {
    $this->browserLangcode = $browser_langcode;
    $form = parent::buildForm($form, $form_state);
    return $form;
  }

  /**
   * {@inheritdoc}
   */
  public function submitForm(array &$form, FormStateInterface $form_state) {
    $this
      ->config('language.mappings')
      ->clear('map.' . $this->browserLangcode)
      ->save();
    $args = [
      '%browser' => $this->browserLangcode,
    ];
    $this
      ->logger('language')
      ->notice('The browser language detection mapping for the %browser browser language code has been deleted.', $args);
    $this
      ->messenger()
      ->addStatus($this
      ->t('The mapping for the %browser browser language code has been deleted.', $args));
    $form_state
      ->setRedirect('language.negotiation_browser');
  }

}