WARNING! Don't install beta 14.12 - after update no settings change is possible in GC.

can you post exact steps you did to fix, please? 

To clarify, this is a workaround for the new regression. But you still can't update the data fields of your activities within the GC app.

1. Set your watch to english (system, language)
2. Set your phone to English (on Android: System, lanuages&Input)
3. The GC app should swith to English automatically
4. You can now access the settings of the watch within the GC app

I am not suer if your issue is the same as I had with 14.12 but this is what i did and it worked for me (ios description)

1. Forget device from BT settings

2. Remove GC app form phone completely

3. Restart FR using the "hold light button in until it powers off completely method" then restart after say 20s

4. Reinstall GC app 

5. Re-Pair the watch

Worked well for me. 

14.13 public release is rolling out now , I tried it and didn't have the same issue as the 14.12 beta

but can you click on activities in settings? 

Yes , I am on iOS 

Yes...all there once again

Good news then, as that has been broken for a long time