Fixed the progress bar colors in firefox and added color variables
Bug introduced by f8f341bb82d7e2db581d29e47212a573dfa05fff
Fixed the Closed Caption button not showing on the first video.
Bug introduced by c7f47a2afdaa877fa6fbce5b660f7860685a3bbf
Fixed a javascript error with the multimedia and the multipli loading of the controls
Merge pull request #5196 from LaurentGoderre/multimedia-fixes

Multimedia: Fixed progress bar colors and close caption button