xdg-user-dirs-gtk is a companion to xdg-user-dirs that integrates it
into the GNOME desktop and Gtk+ applications.
It gets run during login and does two things:
* Tracks changes of locale and prompts the user so the directories can
be changed.
* Creates a default gtk bookmarks file if there is none, based on a set
of xdg user dirs.
Thanks to landry@ for figuring out the weird way this was supposed to
work.