JIRA:EDUCATOR-4367

This would patch all templates (django/mako)
for a possible XSS code injection via
translation files by html escaping them..

LEARNER-4632

... being set and fail if there is none. We were drawing in this
information from the auth_user.first_name and .last_name fields, which
are deprecated on the edX platform.

This reverts commit 375ccb7b.

This reverts commit bf88bca7.

Because we added drf-yasg and pinned djangorestframework

The xblock counting script had a requirements file that was not
previously being tracked and had an out of date version of requests.
Add it to the `upgrade` make target so that it stays up to date.