timo ,
Language: English (United Kindom)
Country or region (on profile info): Slovenia
Please do not ask me to use my phone in my language (Slovenian) - I love it, jusr not for apps and phone and IT topics 🙂
Here is the screenshot:

And screenshot of Fitbit language setring:

If you find a solution for this, it would be great (like region setting having higher priorty than language).
Thanks!