class ConfigTranslationDeleteForm

class ConfigTranslationDeleteForm extends ConfirmFormBase {
    
    /**
     * The language manager.
     *
     * @var \Drupal\language\ConfigurableLanguageManagerInterface
     */
    protected $languageManager;
    
    /**
     * The configuration mapper manager.
     *
     * @var \Drupal\config_translation\ConfigMapperManagerInterface
     */
    protected $configMapperManager;
    
    /**
     * The module handler.
     *
     * @var \Drupal\Core\Extension\ModuleHandlerInterface
     */
    protected $moduleHandler;
    
    /**
     * The configuration translation to be deleted.
     *
     * @var \Drupal\config_translation\ConfigMapperInterface
     */
    protected $mapper;
    
    /**
     * The language of configuration translation.
     *
     * @var \Drupal\Core\Language\LanguageInterface
     */
    protected $language;
    
    /**
     * Constructs a ConfigTranslationDeleteForm.
     *
     * @param \Drupal\language\ConfigurableLanguageManagerInterface $language_manager
     *   The language override configuration storage.
     * @param \Drupal\config_translation\ConfigMapperManagerInterface $config_mapper_manager
     *   The configuration mapper manager.
     * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
     *   The module handler.
     */
    public function __construct(ConfigurableLanguageManagerInterface $language_manager, ConfigMapperManagerInterface $config_mapper_manager, ModuleHandlerInterface $module_handler) {
        $this->languageManager = $language_manager;
        $this->configMapperManager = $config_mapper_manager;
        $this->moduleHandler = $module_handler;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('language_manager'), $container->get('plugin.manager.config_translation.mapper'), $container->get('module_handler'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getQuestion() {
        return $this->t('Are you sure you want to delete the @language translation of %label?', [
            '%label' => $this->mapper
                ->getTitle(),
            '@language' => $this->language
                ->getName(),
        ]);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getConfirmText() {
        return $this->t('Delete');
    }
    
    /**
     * {@inheritdoc}
     */
    public function getCancelUrl() {
        return new Url($this->mapper
            ->getOverviewRouteName(), $this->mapper
            ->getOverviewRouteParameters());
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFormId() {
        return 'config_translation_delete_form';
    }
    
    /**
     * {@inheritdoc}
     */
    public function buildForm(array $form, FormStateInterface $form_state, RouteMatchInterface $route_match = NULL, $plugin_id = NULL, $langcode = NULL) {
        
        /** @var \Drupal\config_translation\ConfigMapperInterface $mapper */
        $mapper = $this->configMapperManager
            ->createInstance($plugin_id);
        $mapper->populateFromRouteMatch($route_match);
        $language = $this->languageManager
            ->getLanguage($langcode);
        if (!$language) {
            throw new NotFoundHttpException();
        }
        $this->mapper = $mapper;
        $this->language = $language;
        return parent::buildForm($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        foreach ($this->mapper
            ->getConfigNames() as $name) {
            $this->languageManager
                ->getLanguageConfigOverride($this->language
                ->getId(), $name)
                ->delete();
        }
        // Flush all persistent caches.
        $this->moduleHandler
            ->invokeAll('cache_flush');
        foreach (Cache::getBins() as $cache_backend) {
            $cache_backend->deleteAll();
        }
        $this->messenger()
            ->addStatus($this->t('@language translation of %label was deleted', [
            '%label' => $this->mapper
                ->getTitle(),
            '@language' => $this->language
                ->getName(),
        ]));
        $form_state->setRedirectUrl($this->getCancelUrl());
    }

}