Discovery screen enhancement

# Checklist

- [x] I have used the search function to see if someone else has already submitted the same feature request.
- [x] I will only create one feature request per issue.
- [x] I will describe the problem with as much detail as possible.

# System info

**App version**: 2.1.0 (0dcf44f67)

**App source**: Google Play / F-Droid / ...
Google Play

# Feature description

**Problem you may be having, or feature you want**:
Currently, when changing Discovery's country to Bulgaria, I get mixed content.

**Suggested solution**:
Add the option to force a specific language along with a location. Note - these should be separate, as many countries have more than 1 official language.