Attract: class name fixes

To work with Bootstrap 4

src/scripts/tutti/10_tasks.js

@@ -277,7 +277,7 @@ function attract_form_save(form_id, item_id, item_save_url, options)
             // jQuery sends the response data (if JSON), or an XHR object (if not JSON).
             if (console) console.log('Failed saving', options.type, xhr_or_response_data);
 
-            $button.removeClass('btn-default').addClass('btn-danger');
+            $button.removeClass('btn-outline-success').addClass('btn-danger');
 
             statusBarSet('error', 'Failed saving. ' + xhr_or_response_data.status, 'pi-warning');