diff --git a/core/modules/config_translation/lib/Drupal/config_translation/Controller/ConfigTranslationController.php b/core/modules/config_translation/lib/Drupal/config_translation/Controller/ConfigTranslationController.php
index 3eb0216..6287a44 100644
--- a/core/modules/config_translation/lib/Drupal/config_translation/Controller/ConfigTranslationController.php
+++ b/core/modules/config_translation/lib/Drupal/config_translation/Controller/ConfigTranslationController.php
@@ -201,7 +201,13 @@ public function itemPage(Request $request, $plugin_id) {
             'title' => $this->t('Delete'),
             'route_name' => $mapper->getDeleteRouteName(),
             'route_parameters' => $mapper->getDeleteRouteParameters(),
+            'attributes' => array(
+              'class' => array('use-ajax'),
+              'data-accepts' => 'application/vnd.drupal-modal',
+            ),
           );
+          // Add the AJAX library to the form for dialog support.
+          $page['#attached']['library'][] = array('system', 'drupal.ajax');
         }
       }