empathy-tls-dialog: add a title for screenshots
empathy-tls-dialog: add a title for screenshots

Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=668681

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