What version of UNA are you using? In version 14RC2 there is support for callendar in BxBaseCalendar.php - there is no need to change anything.
The calendar also supports both your languages, but you have to set the language module correctly because the files for the calendar is zh-tw and zh-cn.
Ok..Unfortunately, I don't have the Chinese language module installed at the moment, but I will install it on a test server tomorrow and take a look at how you should configure it.
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