data: update screenshot
Use a flag to decide if a tab is download-only

There are some cases in which a view may not be able to go back and still be not
just for a download: if the view has been opened by middle clicking somewhere or
by having an URL provided on startup, then the navigation from the overview to
the first page won't have happened. By tracking whether the page has ever
committed a load we can be sure it has been opened just for the download.

https://bugzilla.gnome.org/show_bug.cgi?id=720609
Remember mailman passwords

https://bugzilla.gnome.org/show_bug.cgi?id=698866
Add names to all the timeouts

https://bugzilla.gnome.org/show_bug.cgi?id=710765
widgets: Fix glow button not working

By updating it from Totem. It now uses CSS animations to do
the glow, so it works again.

https://bugzilla.gnome.org/show_bug.cgi?id=720531
Updated Spanish translation
Add missing files that should be distributed
Updated Galician translations