Remove alert and add undo capability

gitlab-ce#23315

progress/pedro/issues/ce#23315-template-warning/ce#23315-template-warning-spec-previews/index.html

@@ -489,6 +489,11 @@ var I18N = {},
                                 name: 'CSS Rem 14px',
                                 unit: 'rem',
                                 scale: 14
+                            },
+                            {
+                                name: 'CSS Rem 16px',
+                                unit: 'rem',
+                                scale: 16
                             }
                         ]
                     }
@@ -1554,7 +1559,7 @@ var I18N = {},
     init.prototype = SMApp.fn;
     window.SMApp = SMApp;
 })(window);
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