BLD-724: ChoiceTextResponse i18n.

Fixed links for units loaded via ajax.

LMS-2711

Fixed staff debug info endpoints for staff member.

LMS-2737

Change Location, CourseLocator, etc to reference opaque-keys library

Ensure no old gems are left behind between test runs.

removes qualaroo from studio (STUD-1684)

Delete orphans was trying to get non-existent 'draft' modulestore

Added more details around Python's support for multi-line translator comments.

Allow courses to set Matlab API key globally, in advanced settings.

Studio Welcome, Sign Up, and Sign In pages Help and text fixes

Updated version of event-tracking library to 0.1.0

Update EASE in edx-platform requirements

Annotation Tools: Load Tinymce in student_view

Fix the title of edit modals from the unit page.

Don't hardcode https protocol in enrollment emails.

Running it beforehand was resulting in a corrupted state
if it was the first time bundle install was run.

Accept span tag from xqueue. BLD-1006.

show a friendly message for an empty course rather than an error page

Fix location.url [LMS-2786]

Use external OpaqueKey implementations

[LMS-2757]

Fix/large email queries 2

Install EASE and requirements

All now go to getting started, but have different tokens, for further
segmenting later.

corrected a typo; tried to clarify a different sentence

Check YouTube Availability for Video Tests