removing the langsupport groups from F18+

[Akira TAGOH]

----- 元のメッセージ -----
| system-config-language uses $yum groupinstall lang-support. I can see
| this works fine with latest F18.
| 
| Only concern is if we are not providing backward compatibility, we
| might need to report bugs against applications using lang-group for
| installing language support.

I'm assuming yum langinstall should still work.

--
Akira TAGOH