Fixes #5589
Use thumbnails downloaded by YoutubeDL in EmbedThumbnailPP
[BYUtvIE] Relax thumbnail regex so test does not fail
format_srt_time uses a comma as the delimiter between seconds and milliseconds while _subtitles_timecode uses a dot. All .srt examples I found on the Internet uses a comma, so I use a comma in the merged version. See http://matroska.org/technical/specs/subtitles/srt.html and http://devel.aegisub.org/wiki/SubtitleFormats/SRT
A common routine is implemented in utils.py and can be used via --convert-subtitles.
alt_title
According to http://en.wikipedia.org/wiki/N-Joy, n-joy.de is a service hosted by NDR, so I put them together.
(closes #5665)
[BRIE] Updated two test cases
And move test from generic, since it's directly handled by MLBIE
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