https://bugs.winehq.org/show_bug.cgi?id=53770
--- Comment #10 from Nikolay Sivov bunglehead@gmail.com --- First we'll need to validate that the change is correct. What is the exact locale name you're using? I'm not totally sure how to check that easily, but you could run your application like this:
WINEDEBUG=+nls,+locale wine <application.exe> &> /tmp/log.txt
and attach resulting file here. Hopefully it will show used locale name somewhere in the log.