Added missing unit tests.

Fix gettext guidance violation

1. No string concatenation should be used in the gettext function.
2. Some extra parentheses should be used in coffee script, to avoid the following situation: in coffee script, the call ```gettext "text to be extracted" + "text should not be extracted"``` will be translated into ```gettext("text to be extracted" + "text should not be extracted")``` rather than ```gettext("text to be extracted") + "text should not be extracted"```.

Mobile/profile default privacy MA-1580

Update date summary blocks.

Clytwynec/custom a11y rules part2

Adds UTC time to the "Today's Date" block, and a fuzzy/relative
timestamp to all other displayed dates.

ECOM-2807

Fix flaky tests related to creative commons

html5 transcript exists

Course Blocks API

Course Blocks App MA-1556

Fixes for chrome automation:

Add response times to get_many/set_many/delete_many.

Update translations (autogenerated message)

Clytwynec/add paver test a11y

TNL-2800

adds an accessible label to the search input and the search button

Updated Zendesk error handling

Fix date summary blocks for courses without an end date.

MA-1044 DiscussionTopic - Added bulk operations