In previous builds Exeterdad claimed that so long as LANG was set you were good to go.
Firefox does not listen to $LANG by default iirc, we would need to fix that in the ff package.
That's probably what he did and I do think it's something we should do to make localization easier for our users, at least in future builds.
eMachines EL-1300G desktop, 1.6GHz AMD Athlon 2650e CPU, 4GB RAM, nVidia GeForce 6150 SE video
CentOS 6.5 (will try VL64-7.1 soon)
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HP Mini 110 netbook, 1.6GHz Intel Atom CPU, 2GB RAM, Intel 950 video, VL 7.1