Oops
(Closes PR #4964)
Test only with 'allsubtitles', the language selection is already tested in test_YoutubeDL.py
Updated the offlinetest make target to not skip it
The required info is already in the webpage
Also, use a single style of quotes
Changing mvod to mvod1 fixes the url, we don't need to add the query.
Change example URLs in readme (fixes #5018)