Guard highlights against null module

Sometimes a course module will not exist and was causing exceptions
in our weekly highlights mail code. This will hopefully guard against
that a bit better.

In an earlier PR, we moved logic from process_view to process
request, so mapping would happen earlier in the middleware
lifecycle, and the code_owner metric would be set for requests
that never made it to process_view.

The temp_view_func_compare custom metric was added temporarily to
ensure this earlier refactor did not introduce any unaccounted for
differences. It did not, so we are removing this temporary metric.

ARCHBOM-1263

Upgrade transifex-client version.

This is only made in order to run the tests with a transifex-client version compatible with python3.8

The actual problem that we have in edx-platform is that the last version of transifex-client has as constraint python-slugify<2.0.0 which is not compatible with the current requierements of edx-platform on the other hand, the current version used in edx-platform is not compatible with python3.8

Hide dates banner archived

Simplify how the course-outline template context is constructed to bring it into parity with other template contexts

* Disable changing special exam type after release date

Do some client-side validation to make sure that exams
that *are* or *ever were* special may not be changed
to a special exam type (other than the current one)
after release date.

MST-258

Co-authored-by: Zach Hancock <zhancock@edx.org>

Revert "Updating the comment."

Allow reset for visible missed dates

Only actually reset user schedule if they have missed deadlines and not missed any gated content deadlines

Fixing RemovedInDjango30Warnings

**Background:** The `django.shortcuts` method `render_to_response` became deprecated in [Django 1.3](https://docs.djangoproject.com/en/3.0/releases/1.3/), when  `render` was introduced.

Per the documentation:

> render() is the same as a call to render_to_response() with a context_instance argument that forces the use of a RequestContext.

Both return an `HttpResponse` object.

**Context:** We changed two statements: An import line and the call to the method, adding explicit parameter names to improve readability.

**Before:**
```
from django.shortcuts import get_object_or_404, render_to_response
...
return render_to_response("teams/teams.html", context)


```

**After**
```
from django.shortcuts import get_object_or_404, render
...
return render(
            request=request,
            template_name="teams/teams.html",
            context=context
        )

```

Removed the FakePaymentPage page object which used shoppingcart app functionality, as well as everything that depended on it. I checked the e2e test repo also, and it doesn't seem to need any of the removed code.

Updating the comment.

* conservative move to process_request
* added temp_view_func_compare metric to be extra conservative

ARCHBOM-1263

rename djang-babel to enmarker

Specify bio field error message for user

Improving user locked out logic.

Currently user message is generic. Specifying for
bio field so that it make more sense to user.

PROD-1582

PROD-1506

Remove shoppingcart references from verify_student and instructor.