Extend bcp47langs.dll with GetUserLanguages

This is an undocumented API used by some programs to fetch the user's selected languages.

Example is Fusion360 (during its login process).

Signature currently taken from here: https://stackoverflow.com/questions/63877075/what-is-the-right-way-to-get-the-users-list-of-preferred-languages-from-the-con (Maybe that stackoverflow answer is also why Fusion has implemented this...)

I'm a first-time contributor, please point out if I'm doing anything wrong

Edited by Marius Schiffer

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