datetime: Remove empty constructor function

It was just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
a11y-settings: Remove empty constructor and dispose functions

These were just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
clipboard: Remove empty constructor function

It was just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
media-keys: Remove empty constructor function

It was just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
mouse: Remove empty constructor and dispose functions

These were just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
orientation: Remove empty constructor and dispose functions

These were just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
print-notifications: Remove empty constructor function

It was just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
rfkill: Remove empty constructor function

It was just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
sound: Remove empty constructor function

It was just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
updates: Remove empty constructor function

It was just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
wacom: Remove empty constructor and dispose functions

These were just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
xsettings: Remove empty constructor function

It was just chaining up.

https://bugzilla.gnome.org/show_bug.cgi?id=707705
Updated Norwegian bokmål translation