diff -u b/core/modules/image/lib/Drupal/image/Form/ImageStyleEditForm.php b/core/modules/image/lib/Drupal/image/Form/ImageStyleEditForm.php
--- b/core/modules/image/lib/Drupal/image/Form/ImageStyleEditForm.php
+++ b/core/modules/image/lib/Drupal/image/Form/ImageStyleEditForm.php
@@ -70,9 +70,9 @@
     $form['effects'] = array(
       '#type' => 'table',
       '#header' => array(
-        t('Effect'),
-        t('Weight'),
-        t('Operations'),
+        $this->t('Effect'),
+        $this->t('Weight'),
+        $this->t('Operations'),
       ),
       '#tabledrag' => array(
         array(