Honor "use-stock" property for the HildonButton title
Honor "use-stock" property for the HildonButton title

If GtkButton:use-stock is %TRUE, look up for the string in the title
in the stock.

community-ssu/hildon,community-ssu/hildon,archlinuxarm-n900/libhildon,archlinuxarm-n900/libhildon,community-ssu/hildon,archlinuxarm-n900/libhildon