How to change calendar week start day to be monday and not sunday?
Also is it possible to change date format returned from calendar in the text input box? Language locale setting doesn't help with this
For the calendar start, it's something you could post in suggestions. I don't recall seeing it before (and we do have a lot of international customers, so it's not necessarily a huge priority for a lot of people).
The format displayed when a date is selected is necessary for technical reasons so it's not changeable.