network: add Team to connection editor (rh #1040525)

https://bugzilla.redhat.com/show_bug.cgi?id=1040525
Signed-off-by: jirka <jirka@localhost.localdomain>

https://bugzilla.gnome.org/show_bug.cgi?id=720312
network: make "(none)" slaves (bond, team, bridge) translatable

Signed-off-by: Jiří Klimeš <jklimes@redhat.com>

https://bugzilla.gnome.org/show_bug.cgi?id=720312