A family of Microsoft word processing software products for creating web, email, and print documents.
I've discovered the same problem. My default is UK English but reveal formatting shows the same "(Asian) Chinese (PRC)" immediately under the Language tab followed by (Other) English (UK).
I write government papers and this behaviour is troubling.
I have only seen this behavior with documents converted from OpenOffice (*.odt) format. Copying a correctly formatted style from another document may fix the problem (but it doesn't necessarily work).