- Handle special cases for languages where the number is not shown
- Rework the Downloader base implementation, allowing for more
advanced things to be done
- Separate the localization from the content country (just like
YouTube let's the user choose both).
It is not always possible to get the url in the form "https://www.youtube.com/channel/...", so a not has been added whenever that happens to be the case (i.e. only in InfoStreamItems).