You should be able to rename the ZH.LNG file to ZH-CN.LNG and it would have the same effect - defaulting to English. The problem with how we did this was that we just included ZH.LNG (simplified), which your PC defaulted to without the more explicit ZH-CN.LNG naming.
That said, we would accept a Traditional Chinese translation submitted from any user - you, if you we so motivated and felt capable. We would be willing to add an Object Desktop subscription to your account, for an extended period, should you consider taking this on and the translation was of a quality would could use (it would be proofed - of course).
The format in the en.lng file, and viewing the others, should provide the guide to how it works.
"English text"="Translated to other language text"
For Traditional Chinese, the finished file name would be ZH-TW.lng.
Private message me if you were interested, Triguys, and thanks for the feedback.
Sean Drohan
Stardock Support Manager