I have an ancient SONY NW-507 MP3 player (I still love it because of the 60hrs battery life) that the MP3 Manager software just interpret ANSI names encoded in the ID3 tag based on whatever system language the program started on.

I used to use AppLocale for that. There was a better variant called pAppLocale (or paip Applocale) but it’s no longer maintained anymore. Today I discovered a modern, much more powerful equivalent called Locale Emulator.