How can I change the language at the datepicker?

Where can I find a guide or a tutorial to do it? in the guide, that I have downloaded (cf6manual-1.0.2.pdf), I can't find anything.

Hi Fritz,
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You can set your own names in the Extra Attributes box on the DatePicker Advanced tab - for example:

data-days:Sx, M, D, M, D, F, S
data-monthsShort:Jan, Feb, Mar, Apr, Mai, Jun, Jul, Aug, Sep, Okt, Nov, Dez
data-months:Januar, Februar, März, April, Mai, Juni, Juli, August, September, Oktober, November, Dezember

Bob

Thank you for your suggestion! In these days I had to clone the customer website (for new works) and I didn't have time to test your solution right away.
I have entered your code, have saved the module (deleted the template so that it was automatically set up new), but unfortunately it does not work.

Hi Fritz,
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Can you post a link to the form?
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Bob