The official demo of jqueryui datepicker l18n IS NOT WORKING

The official demo of jqueryui datepicker l18n IS NOT WORKING

probably i'm crazy, but when I go to jquery ui date picker demo, I clicked on 'localization' , on the left

But for each language i selected, no changes were made.

It's an example's bug ?

See: http://jqueryui.com/datepicker/#localization