Localization

Hi!
I’m using free version of this great plug-in.
I would like to customize it so it could show dates in different date formats, in my case d. m. yyyy. or d. month yyyy.
Is there a way to do it. Also, I’m interested in translatig this plug-in in my language (Croatian)
Thax in advance ??

https://www.ads-software.com/plugins/wp-datepicker/