save dates on enter key press
STUD-1506
BLD-753: Add i18n for LTI.
Merge pull request #3216 from edx/zub/bugfix/std1506-savedate

save dates on enter key press
Merge pull request #3246 from edx/anton/i18n-lti

LTI i18n
Work.
Update numbering of acceptance tests.
Fixing test.

Only 00:00:10 needs to be passed. It will be converted by xfields::from_json
method.
Removed unnecessary screenshot captures.
Removed unnecessary import.
Adding more tests.
Adding another test.

Fixing YouTube mocked server.
Fixing bug.