BLD-642: Allow multiple transcripts with video.
Move asset related metods to utils.
Move sjson methods to utils.
Add js unit tests.
Add code for handling changing of srt file.
Fix for updating content of transcripts file.
Reorganize video tests.
Add tests for handle ajax.
Add tests for youtube transcripts.
Add changelog.
Fix when transcritps are not changed in Studio.
Fix .sub in acceptance tests.
Fix typo in acceptance tests.
Patch requests get method in tests.
Fix pep8 bugs.
Fix pylint bugs.
Fix typo in acc.tests.
Fix function interface.
Fix typo.
Generate sjson from translations srts on every save.