calendar

The default calendar is the Gregorian calendar. How can I change to Jalali calendar?
Gregorian date like: 01/01/2021
Jalali date like: 01/01/1401
https://en.wikipedia.org/wiki/Jalali_calendar
This typical user task is handled by Moment.js
How to use jalali-moment?

I have an instantiation form that use 2 calendar widgets but they appear to be only english localized

I am using the 7.2 community edition and testing using the studio.

Using the ACME Organization:
Connected user: walter bates
Preferences / language : french

The portal is localized in french (Bienvenue, Paramètres...) but not the date picker.

Is it a bug or dit I miss something?