[PATCH] Language Support spoke

[Radek Vykydal]

Kickstart command lang is extended with --addsupport option for
specifying additional (to ksdata.lang.lang) language support to be
installed (ksdata.lang.addsupport).

In the spoke GUI, ksdata.lang.lang (system lang) is selected and
grayed-out (insensitive).

Selected (using checkbox) languages are displayed in bold, the list is
searchable in the same way as the welcome spoke list. Currently only
available translations for installer (the same as in welcome spoke) are
in the list.

screencast:
http://rvykydal.fedorapeople.org/langsupport.ogg