Fixed displaying video language codes.

This changes things so we correctly display codes not in the 'unisubs'
mapping (codes not normally given as choices for the user).
Don't do indexing inside the move_videos view

Using the video_changed_tasks task moves the work to the worker
process which is much nicer.
Merge pull request #1850 from pculture/video-language-code-display

Fixed displaying video language codes.
Bumping versions
Merge pull request #1847 from pculture/gh-1837

Don't do indexing inside the move_videos view
Move to a single optional repo
Merge pull request #1854 from pculture/merge-optional-repos

Move to a single optional repo
some test updates
Merge branch 'staging' into gh-1846
Fixed call to universal_url()