DatePicker issues with locale medium date format

DateTextField as follows: DateTextField d = new DateTextField(id, model, new StyleDateConverter("M-",false));

Case 1:

• en-US locale
• for example DatePicker insert 04 rather than Apr in DateTextField, even though pattern clearly says MMM

Case 2:

• pl-PL locale
• 2010-10-25 is in the DateTextField
• DatePicker opens on April 2031 rather than October 2010

I believe the problem lies in wicket-date.js, in functions substituteDate and parseDate.

I know this might be duplicate of WICKET-2427 and WICKET-2375, but apparently this hasn't been properly fixed yet.