save dates on enter key press
STUD-1506
Merge pull request #3216 from edx/zub/bugfix/std1506-savedate

save dates on enter key press
HD control is hidden initially. On first play of video, when
player.getAvailableQualityLevels returns a non-empty array, it will eventually display, if HD qualities are available (highres, hd1080, hd720). [BLD-937]