Ok, the localization stuff seems to work fine, but the choose language box isn't working with the zip files. It is adding a trailing / to the language names so it isn't changing the language correctly. I will fix this in the first patch.
Setting the language using the console works fine though. At the console use the following commands (depending on which language you want to set of course):
Depths of Peril, Kivi's Underworld, Din's Curse, Drox Operative, Zombasite, Din's Legacy, & Drox Operative 2