adjust focus order and fix duplicate ids in video player (TNL-6361, AC-587)

move focus to slider on caption select (TNL-6361)

toggle video playback on spacebar press

sr text for spacebar explanation

focus on slider container instead of handle

linter issues

cleanup

quality

more quality

ugh wrong var name

hack to get around linter

more quality

pls work this time

fix transcript height test

hopefully last one

fix some ie/ff issues

fix dupe ids in video sr instructions. [AC-587]

fix test