Make a copy of the original lang0.pak and store it in your documents folder or where ever else you wish. That way next time an update comes about, and we all get a warning ahead of time, you can simply replace it and then patch. That way you won't have to deal with uninstalling and reinstalling the entire game. You'll have a clean untampered lang0.pak and the new patch will be none the wiser that you messed with the coding to begin with.
Yes this is something important :D in fact, I think the mods of this forum should post those files for download, just like they did with the english patch. Well its just an opinion...