(fix) Better transcoding error message

Brian Hatchetrequested to merge
brianhatchet/front:transcoding_status into master

If the direct source video fails to play, it calls the fallback. The fallback calls the transcoding endpoint which verifies that there is a source file. If the source file has been deleted, it will return a "This video has been deleted..." error. It will also return the list of transcodes in the response.

This goes with this backend MR engine!194 (merged)

Fixing #912 (closed)

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