@Jherkel-
You can set Roku's default language to English (Settings / System / Language) but it is up to the programmers of each individual channel app to honor that setting, and some may not.
For those that don't, look for a setting within the channel app itself to see if it has an overall language setting. You might also look on the channel's website to see if this is something you can set there for your account with them.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X