Fix for STUD-1311

STUD-1311

Video: Revert Download transcript button behavior.

Video: Fix for Download Video link.

Don't internationalize strings we use for enrollment.

LMS-2218

Refactor student views

Add a second fake translation language

Add Greek language translations

Remove unused imports.

Accessibility improvements to the sequence navigation

Fix pylint/pep8 warnings, use JsonResponse instead of HttpResponse where useful,
put in TODOs to change HTTP status codes to be more accurate.

For a11y, modal dialogs and script templates should be hidden...

Fix pylint violations

Add pycharm helpers to gitignore

Updated title and template for image modal html component

i18n word cloud LMS-2197

LMS-2215

Registration HTTP status code fix for release

Enable (and test) xml export of pure XBlocks

Add the ability to view templates in a browser in development mode

Skip tilde files when importing

fix tests that were breaking on dev envs due to TIME_ZONE='UTC'

Avoid requesting unnecessary thread responses

This adds a simple mechanism to view any template file directly in a browser. The intention is that we can use this to build up reference HTML files which illustrate common UX patterns. We can then view the resulting pages without having to have a working implementation.

In development mode, the URL is /template followed by the path to the template file. For example, you can view the 404 page at:

    /template/404.html

You can also supply string parameters to the template by specifying them as query parameters in the URL.

e.g.  /template/my_template?name=Foo