ui-utils: Set translation domain on GtkBuilder UIs
ui-utils: Set translation domain on GtkBuilder UIs

This is necessary for when GtkBuilder UIs are used outside of the main Empathy
process.

Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=617909

GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets