I've made tests on simulator and the real device. Yes, I changed the language, multiple times. The link you sent didn't help, I already followed the steps there. I deleted and installed again but nothing changed.

Is there anyone who can help?

i am having a similar problem. did you solve the problem? https://developer.apple.com/forums/thread/693080

I found an interesting thing. When I switch the language of the phone to Turkish, the Turkish InfoPlist.strings file is working and when I switch the language of the phone to English, the English InfoPlist.strings file is working. But, when I switch the language of the app to English and when the current language of the phone is Turkish, the working InfoPlist.strings is still Turkish. Can it help us to solve this problem? https://player.vimeo.com/video/644771065