This makes use of the new babel-plugin-django-gettext template literal

support in our ES6 JavaScript files, giving us much more readable code,

especially when long strings are concerned.
We can now use the new _ prefix and break strings into multiple lines,

and the plugin will take care to clean up the whitespace and turn them

back into single-line gettext() calls. We can also reference variables

in template literals, and the plugin will turn them into interpolate()

calls (though we don't make use of that currently int his codebase).
There are still files that aren't converted to ES6 in this codebase, and

there are likely a lot of unlocalized strings, but this change doesn't

tackle either. It's really the changes that were being tested during the

development of the plugin.

Built a package and compared the generated code to the source code.

Saw that each and every new-style localization was converted to an

old-fashioned gettext(), with the expected strings.