Apply suggestion from @arman-boyakhchyan

Co-authored-by: Arman Boyakhchyan <arman.boyakhchyan@devexpress.com>
Signed-off-by: Sergei Burkatskii <sergei.burkatskii@devexpress.com>

Author: 2 people

packages/devextreme/js/ui/widget/ui.errors.js

@@ -400,5 +400,5 @@ export default errorUtils(errors.ERROR_MESSAGES, {
     /**
      * @name ErrorsUIWidgets.W1029
      */
-    W1029: '"hiddenWeekDays" must leave at least one weekday visible.',
+    W1029: '\'hiddenWeekDays'\ must leave at least one weekday visible.',
 });