Allow timetraveling on data structures admin pages.

src/Form/UserAdminForm.php

@@ -250,6 +250,13 @@ class UserAdminForm extends AbstractType
             'disabled' => ! $this->security->isGranted($is_new ? 'create' : 'edit', $entity),
         ]);
 
+        $builder->add('log_comment', TextType::class, [
+            'label' => 'edit.log_comment',
+            'mapped' => false,
+            'required' => false,
+            'empty_data' => null,
+        ]);
+
         //Buttons
         $builder->add('save', SubmitType::class, [
             'label' => $is_new ? 'user.create' : 'user.edit.save',