Updated Italian translation
doap: update URLs
Updated Slovenian translation
Require GTK+ 3.12

We forgot to bump the GTK+ requirement when using GtkDialog's new
use_header_bar property.

https://bugzilla.gnome.org/show_bug.cgi?id=727720
Stop using custom markup on message dialogs

Get with the new style. It's lightweight and not bold and not large.
That is, it's the default.
Add a warning dialog when using Resign

https://bugzilla.gnome.org/show_bug.cgi?id=727788