MAGETWO-97046: Incorrect rendering

Author: svitja

app/code/Magento/Customer/Ui/Component/MassAction/Group/Options.php

@@ -5,7 +5,6 @@
  */
 namespace Magento\Customer\Ui\Component\MassAction\Group;
 
-use Magento\Framework\Phrase;
 use Magento\Framework\UrlInterface;
 use Zend\Stdlib\JsonSerializable;
 use Magento\Customer\Model\ResourceModel\Group\CollectionFactory;
@@ -126,11 +125,6 @@ protected function prepareData()
                 case 'paramName':
                     $this->paramName = $value;
                     break;
-                case 'confirm':
-                    foreach ($value as $messageName => $message) {
-                        $this->additionalData[$key][$messageName] = (string) new Phrase($message);
-                    }
-                    break;
                 default:
                     $this->additionalData[$key] = $value;
                     break;