Add an empty, normally invisible label after checkboxes and radio buttons
with cbi-input-{checkbox,radio} classes to allow CSS styling them as
suggested on http://www.paulund.co.uk/style-checkboxes-with-css
Signed-off-by: Nils Schneider <nils@nilsschneider.net> Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>