This introduces a new dependency on babel-plugin-django-gettext, which

will allow us to have more clean localization in the JavaScript

codebase, taking advantage of multi-line strings and easy variable

references using template literals without worrying about the impact on

whitespace or the message scanner. This new plugin is also set up to be

activated in Babel.
It also updates some existing build-time dependencies, capping the

version ranges on a few and updating to the latest versions of

beanbag-docutils, kgb, and less.

Updated all dependencies, verifying that they installed correctly and had

the expected versions.
Built packages and ran unit tests successfully.