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.
Link to [good first bug] bugs, not [mentor] bugs

Maris informed me today that he uses [mentor] to tag bugs that need a
mentor, regardless of difficulty, and that he uses [good first bug] for
bugs that would be easy for volunteers to pick up.
Add shortcuts to useful objects to analytics closure
Update installation-vagrant.rst
Merge pull request #1876 from jezdez/static-i18n-js

Embed JavaScript translation into page.
Update last loaded scripts to be async for marginally faster onload's
Merge pull request #2207 from ezio-auditore/patch-1

Update installation-vagrant.rst
Merge pull request #2205 from openjck/update-bugzilla-link-again

Link to [good first bug] bugs, not [mentor] bugs
bug 950945: Fix an error with waffle while attempting to generate sphinx theme layout
Merge pull request #2209 from lmorchard/fix-sphinx-theme-generation

bug 950945: Fix an error with waffle while attempting to generate sphinx theme layout
Merge pull request #2206 from darkwing/analytics-update

Add shortcuts to useful objects to analytics closure
Merge pull request #2191 from darkwing/minor-speed-perf-dos

Update last loaded scripts to be async for marginally faster onload's
Adding the Promote MDN embeddable script.
Merge pull request #2210 from riverspirit/promote-mdn-script

Adding the Promote MDN embeddable script.