Fixed load_video_languages() to use the correct attribute (#726)

The attribute name changed with the DMR changes.
added webdriver test for gh-726
fail if no search results
Merge pull request #767 from jdragojevic/wd-726

Wd 726
Merge branch 'staging' into docker
added docker config
Merge branch 'docker' into staging
updated docker config
Run gauge_videos_long less often
Merge pull request #768 from pculture/run_gauge_videos_long_less

Run gauge_videos_long less often
updated docker setup
Merge branch 'staging' of github.com:pculture/unisubs into staging
Merge pull request #776 from pculture/gh-726

Gh 726
Merge remote-tracking branch 'origin/staging' into production