I just want to try this game and downloaded a demo version.
After checking how to control this game, I changed my game language to Chinese Tradictional (zh-TW) and restart my game, all the words in this game is gone, and I have to delete configs so I can try this game.
I can confirm that this happens, with the demo and the main game, on both Windows 7 and Windows 8.1.
Interestingly, other languages using special characters (Chinese zh-CN, Japanese, Hebrew, Russian) always work.
There was an error, that the chinese font wasn't setup in this translation, I changed it (I used the same font as for simplified chinese, I hope it works properly).
So this should be fixed for 0.12, thanks for the report.