Issue #3276613 by unstatu, kristiaanvandeneynde: Warning when deleting a revision

src/Entity/Form/GroupRevisionDeleteForm.php

@@ -111,7 +111,7 @@ class GroupRevisionDeleteForm extends ConfirmFormBase {
     $this->messenger()->addStatus(
       $this->t('Revision from %revision-date of @type %title has been deleted.', [
         '%revision-date' => $this->dateFormatter->format($this->revision->getRevisionCreationTime()),
-        '@type' => $group_type,
+        '@type' => $group_type->label(),
         '%title' => $this->revision->label(),
       ])
     );