What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Unfortunately, it is not possible to change the languages of the Date selector in the configurable list, yet.
I have forwarded this request to our software development team in order to consider implementing it. As soon as this feature will be available you are going to be informed via this thread.
You are able to edit the translations of Date field as you can see the following screenshot:
Maybe, you can consider using this for a while.