How to change /etc/sysconfig/i18n LANG= during kickstart?

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http://www.linuxquestions.org – B/c Citrix is apparently oh so very much fun to work with, I'm looking to find out if there's an effective way to change the LANG= parameter of the /etc/sysconfig/i18n file to the compatible Citrix one during a new machine install (kickstart). So, all I'm looking for are suggestions on how I can pass this through during a kickstart, either during the KS, or using some postinstall script, etc. I've added "lang en_US.iso88591" to the ks.cfg file, but I think all it's doing is passing that along for the KS session, but not for the actual running environment on the PC after the KS has (HowTos)