How do I change the language to english on the Hero 8
If ever you can't understand the language that was set.
Try to use Google Translate App.
The camera auto translates the word.
or check this video: https://www.youtube.com/watch?v=qOW-OqXexNg
From which one?
To change UI language: Preferences > Regional > Language >
To change Voice Commands language: Preferences > Voice Control > Language >