net-im/corebird-9999: remove 'glade' USEFLAG

The ability to decide whether or not glade catalogs are built with
corebird has been removed upstream
net-im/corebird: Add nls USEFLAG
net-im/corebird: Remove all ebuilds for versions < 9999

net-im/corebird-0.8 is now upstream, as such we don't really need these
ebuilds, they just conflict with upstream's