Jellyfin for iOS 1.8.0

Jellyfin for iOS v1.8.0 is available in the App Store now!

- Fixes background audio playback (finally)
- Fixes for Jellyfin 12.0 compatibility
- Fixes transcoded downloads sometimes using invalid file extensions
- Updates supported locales

https://github.com/jellyfin/jellyfin-ios...g/v1.8.0.5