Date selection popups: it should be possible to specify Monday as first day of the week

Date selection popups: it should be possible to specify Monday as first day of the week

I'd like to see an option in the Admin-Panel, where I can define "Monday" to be the first day of a week for in Date selection popups.
 
 
It happens quite often, that out of behaviour, our technicians open a Date selection popup select the first row - thinking of that it's Monday. But as of now, the first row is Sunday.

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