How to change Datepicker language

[Brandy]

Is it possible to change language of datepicker?
I saw that there are JS files with different languages for datepicker and I saw on datepickers homepage that it is possible to change, but how do I in CKForms 1.3.1?

I'm using M17n for different languages (not JoomFish) and the CKForms plugin.
There's a parameter in the article to specify the language. It would be great if CKForms could be called like {ckform formname?lang=de}

[jacobo221]

I posted a patch in another thread:

viewtopic.php?f=5&t=95