Alternate languages aren't used

Hello. I’m using the latest experimental build (as of July 5th) and am trying to get Cataclysm to run with alternate languages, particularly Chinese — I’m studying the language currently and would like to learn when playing CDDA, too! I’ve done/tried the following:

  • Compiled all .mo files.
  • Changed the game’s language via the options menu. No change.
  • Run Cataclysm with LANG=zh_CN, etc. No change.
  • Changed the actual system locale. No change.
  • Renamed the relevant files in lang/mo to en_US. No change.

It seems like Cataclysm isn’t actually using the .mo files at all. Have I missed some step in the above?