Rewrite opensubtitles api integration using the json api
I rewrote OpenSubtitles integration but it is not complete. I rewrote OROpenSubtitleDownloader class but other classes need to update.
Known issues are:
- The fetched languages are not localized
- Subtitle metadata isn't showing correctly on tableviewcell
- The language picker shows language code instead of the full name
Also this is my first objective-c contribution so I am open to feedbacks.
Related issue: #1702 (closed)