Change the first day of the week to Monday for en_GB

[Duncan Parkes]

There is occasional debate over this, but the modern week in the UK
runs Monday to Sunday.

For evidence - here's the calendar of the UK parliament:
​http://services.parliament.uk/calendar/

And a couple of support threads suggesting Americans change their
locale to en_GB on Microsoft and Apple in order to get their calendars
to start the week on Monday:

​http://answers.microsoft.com/en-us/winphone/forum/wp8-wpemail/how-do-i-change-the-first-day-of-the-week-in/37c27997-1a18-4e51-91b4-fe2b3cd26496
​http://forums.macrumors.com/showthread.php?t=1460577

[Duncan Parkes]

Pull request: ​https://github.com/django/django/pull/3126

[Aymeric Augustin]

Following the lead of Microsoft and Apple seems reasonable in this case.

This change deserves a line in the release notes, doesn't it?

[Duncan Parkes]

It certainly does - I've added something and pushed a new commit.

[Tim Graham]

Don't forget to uncheck "Needs documentation" so the ticket appears in the review queue.

[Tim Graham <timograham@…>]

In be8ccc26488552123cd371645dcb4fd13c05fe80:

Fixed #23371 -- Changed en_GB first day of the week to Monday.