Test Release Audio only changes #698

The changes are mostly hidden, we only just got one new option and the Audio only mode has been moved from the settings to the same drop down as the old Subtitles only.

The new Merge Audio with existing files allows to create video files with more than 1 dub.
This is currently limited to an exact name match, using the Dub language in the file name is a mismatch!
If no match is found it just downloads the episode as usual, this allows to keep that option on all the time.