Fix accidentally exposed Supply Chain course run

Bump problem-builder to v2.6.5

Flaky video translations test fix.

PLAT1122 - Upgrade Django to 1.8.17

It includes support for course keys longer than 50 characters.

See: https://github.com/open-craft/problem-builder/pull/131

[ENT-61] Changes to accommodate consent logic on Enterprise app

removes redundant alt attribute value

Sadly, I introduce a time.sleep here. The hovering over the elements is
particularly brittle, and there is no obvious signal for when the page is
done rendering. I'm putting a sleep in here so we can more-quickly support
Firefox 45.

Add method attribute to make sure login, registration, password_reset…

Fix TNL-5453

Add method attribute to make sure login, registration, password_reset, and financial_assistance forms are always submitted via POST. SEC-223

Go back to comparing timestamps in has_database_updated_with_new_score

Also fixes issue where ORA grades were never updated, by including
them in this check.

TNL-5994
TNL-5995

Update sidebar text re Activate permissions

Changes required for the Enterprise app enrollment feature.

ECOM-6452

Support the display of downloadable PDF course certs

Allows course team to directly activate / disable web certificates

Don't skip migration test

Grade Report rename "Not Accessible" to "Not Available".

ENT-11 Adding link to enterprise page in the footer

Update translations (autogenerated message)

grading events

Fix edx-val version upgrade string

Added enterprise link, moved media kit down to second line, and adjusted styling
to avoid wrapping when possible.

for TNL-5045