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Code
-Remove Favorites from private feeds
(I think that youtube has not supported the special Favorites palylist for a long time. It only mislead users)
-Update language files after remove Favorites
-YouTubeApi: remove unused after remove Favorites
-YouTubeVideoUrl: Use redirected video id if any, thx dstftw
-YouTubeVideoUrl: remove unused variables in functions
-YouTubeVideoUrl: remove forgotten encoding in _parse_qsl