Log Message:
gnome-calendar: update to 40.0.

This builds with current glib2.

Major changes in 40.0:
* Updated translations

Major changes in 40.rc:
* Updated translations
* Minor cleanups

Major changes in 40.beta:
* Updated translations
* Use HdyViewSwitcher in the main window
* Fix the color of new calendars

Major changes in 40.alpha:
* Updated translations
* Depend on libhandy-1
* Port to the newer libgweather api
* Improve the event editor