TNL-836

These were found by the new pylint checker I wrote! :)

Fix link stylings in LMS and CMS footers

This provides a better UX for video uploaders, because recent uploads
are readily visible at the beginning of the table.

[OPEN-444]

TNL-1185

Tyhe sign in form should not be submitted before the submit event is
ready to be intercepted. This can occur if the user clicks too fast on
the sign in button.

Context: We have witnessed multiple, seemingly random "CSRF verification
failed" errors while signing in (with valid ID) to the Studio.

Explanation: The login form does not initially include a CSRF field.
The CSRF header of the request is appended to the studio login request
headers by intercepting the form validation. This intercept is performed
by the login.js script. Unfortunately, the login.js script is loaded
pretty late (at the end of the template). So if the login form is
validated sufficiently fast, the login.js script has no time to load and
append the X-CSRFToken header to the request.

Proposed solution: the CSRF token is already passed to the template via
the login view, so we just add a hidden field to the login form to
include the csrf token.

This fixes two bugs:
1. All statuses were listed as "Unknown"
2. Non-ASCII characters in a header column translation resulted in a 500

This reverts commit b8184d18.

TNL-935

[second attempt which addresses bug building Studio]

This fixes two bugs:
1. All statuses were listed as "Unknown"
2. Non-ASCII characters in a header column translation resulted in a 500

The CSS is also restructured a bit to style both the progress bar and
the status text based on the state of the upload using a single class
on the parent element.

This reverts commit 1d6fceda.

Respond to review comments:

- Rename build and config files for consistency between lms/studio.
- Fix merge conflicts with lms require config.
- Devstack uses optimized pipeline to skip require JS optimizer step
- Add tests for render_require_js_path_overrides

Fix i18n for video status strings (broken in commit 4b53f4df) and remove
unnecessary complexity from a test case. This also removes the status
whitelist in the video upload configuration. Because status is included
in the CSV report, it is not necessary to filter the included videos by
status.

TNL-1142

Several IE bugs have been fixed in 2.4.

returns XBlockuser with 2 data layers

path.py objects report themselves as class objects, which confuses the heck out of
pylint. It tries to match variable names using the class-rgx regular expression
instead of the constant-rgx regular expression, and it doesn't match, so it
throws an error. Not sure how to fix pylint, so we'll just ignore these errors.