Date picker problems

Hi,
i have some issues with the Date Picker option.

I have the website in Italian language, if i set the date picker in “it” on the language dropdown selector, it remains in english (the days name and the start day of the week). I’ve tried a lot of times, reinstalled plugin and a lot more but nothing. Continues to stay in english language.

Second thing: it’s possible to set that if i select one day on the first picker, the second one starts from the day after the first i picked on the previous box?

take a look here:
http://www.hotelstanchini.com/contatti/

https://ww.wp.xz.cn/plugins/caldera-forms/