accounts-dialog: improve the 'no protocol installed' message
accounts-dialog: improve the 'no protocol installed' message

https://bugzilla.gnome.org/show_bug.cgi?id=670203

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