only in patch2:
unchanged:
--- a/core/modules/views/views.theme.inc
+++ b/core/modules/views/views.theme.inc
@@ -159,7 +159,7 @@ function template_preprocess_views_view_fields(&$variables) {
 
       // Set up the label for the value and the HTML to make it easier
       // on the template.
-      $object->label = SafeMarkup::checkPlain($view->field[$id]->label());
+      $object->label = $view->field[$id]->label();
       $object->label_html = '';
       if ($object->label) {
         $object->label_html .= $object->label;