Mixed languages inside of the app

### ⚠️ Before posting ⚠️

- [x] This is a **bug**, not a question or an enhancement.
- [x] I've [searched for similar issues](https://github.com/nextcloud/android/issues) and didn't find a duplicate.
- [x] I've written a clear and descriptive title for this issue, not just "Bug" or "Crash".
- [x] I agree to follow Nextcloud's [Code of Conduct](https://nextcloud.com/contribute/code-of-conduct/).

### Steps to reproduce

My Nextcloud and my phone are both set to English and all my apps follow the system language.

However, when using the Android app and I go to `Settings`, suddenly everything is in German.

Additional information: I have German as a secondary language set up on the phone. Could this be affecting the Nextcloud Android App? The phone is new, and I have only been using it for less than 3 weeks.

Screenshots:
- English for menu: https://drive.proton.me/urls/680VESJQTR#xNS9dz9lFvqj
- German for settings: https://drive.proton.me/urls/C7WBT9YE1M#lIgGTmtaP7c9

### Expected behaviour

Everything in the app should follow the system language and be in one language. It should never mix different languages.

### Actual behaviour

When using the Android app and I go to `Settings`, suddenly everything is in German, while outside of Settings, everything is in English

### Android version

Android 15

### Device brand and model

Pixel 8a

### Stock or custom OS?

Custom (explain in "additional information")

### Nextcloud android app version

3.31.0

### Nextcloud server version

29.0.9

### Using a reverse proxy?

I don't know

### Android logs

_No response_

### Server error logs

```bash

```

### Additional information

grapheneOS