Calendar: Monday as first day of the week

In the Plan module and Timeline view, as well as in tasks and workflows, calendars are shown with date selectors. These calendars starts with Sundays. However we always refer to Mondays as the first day of a week. There's a risk of miscommunication due to this. Please see printscreen as an example: https://www.screencast.com/t/U6JBjsJ1

Also, it has happened that users have selected a deadline on a Sunday instead of a Monday, since they chose "the first day of that week". It seems like an easy fix to implement a selection of which day that should be displayed first in the calendars under Settings/Organization, where users can choose business days "Monday to Friday" already today. That would make it a lot more user friendly.