Fix discussion color contrast and remove gradients

TNL-5163

pa11ycrawler 1.3.0

Merge pull request #13314 from edx/tasawer/bugfix/ecom-5301-hyperlink-fixed-to-be-accessed-with-keyboard

Heperlink changed to button to be accessed with keyboard users

Adjust safe templates thresholds.

Fix typo in class name, remove incorrect class.

ECOM-5301

Fix TNL-5249: inconsistent state in discussions UI

Fix platform API documentation build

Fix the edx-documentation link

AC-566 fixing contrast for copyright

Fixed import failures that were preventing the platform API documentation from building. The problem is that the doc building environment doesn't need to install all the Python modules that the platform software does, but when Sphinx tries to import select modules so that it can use autoclass to publish docstrings it tries to import all the modules that are imported by those modules, recursively. I mocked the missing modules.

Updated copyright year for LMS / CMS

Fixed focus should remain within the simulated dialogs.

ORA version bump

Fix mongo store's has_course with a split course key

ECOM-5303

Release with hotfixes 2016-08-23

Update translations (autogenerated message)

Hotfix: edx-opaque-keys 0.3.3, OpaqueKeyField newline usage log, fix inline JS for CCX navigation

TNL 5057 Silence XML parse error in capa_module

Grades cleanup

check for null doc

Correct the key when reading from DB into a key object.

PLAT-1046 – update library content block's children on branches

TNL-5057 This un-actionable error is polluting the stream of devops pages, and
should be quieted. A longer term fix will be made in TNL-5245.

Small changes to the grades djangoapp
    -sets up mock_get_score context handler
    -fixes an issue with not invalidating lazy scores property
    -code quality fixes
    -query count optimization in PersistentSubscetionGrade.create
    -adds atomic blocks to avoid IntegrityErrors corrupting an entire request

Hotfix for TNL-5365