Embed JavaScript translation into page.

This also fixes the name of the LANGUAGES setting to adher to what Django expects —  an iterable of two-tuples. The settings dict setting is now called LANGUAGES_DICT.
With this in place the deployment only requires running `./manage.py compilejsi18n`.

Fixes #1809.
Merge pull request #1876 from jezdez/static-i18n-js

Embed JavaScript translation into page.