In this commit, the correct week number is set in week-view.
The problem is, the week number of week-view is being set according to
the first day of the week (if the first and last day of the week
are in the same year), or the first and last day of the week
(if the first and last day are in different years).
To fix this, the week number is being set according to the middle day
of the week (according to ISO 8601 standards), resulting in correct
week numbers.
https://bugzilla.gnome.org/show_bug.cgi?id=779331
In this commit, the first weekday is set for week-header & week-grid.
The issue is, the first weekday is being set only for week-view,
resulting in incorrect display of weekdays in the week-header.
To fix this, the first weekday for week-header & week-grid is set
along with that of week-view.
https://bugzilla.gnome.org/show_bug.cgi?id=779346