Hi there Tinamosberger,
We can provide some guidance. It's a bit different for the download languages you use in the Apple TV app. Follow these steps to choose your download language:
To choose the audio languages that are downloaded with your videos, open the Settings app, scroll down and tap TV, then tap Languages. Tap Add Language and choose the languages that you want to add.
You'll find this information here: Change subtitles or languages for videos in the Apple TV app or iTunes Store - Apple Support
After you've ensured you have English selected as your audio language in Settings, try closing the Apple TV app, then reopen and attempt to select the language with these steps:
1. While watching a video, tap the screen to open the playback controls.
2. Tap the More Controls button
.
3. Choose Subtitles or Languages.
Take care.