[Bug 847976] Use locale for question progress.

The question listing progress bar did not consider any filters,
specifically locale filters. Considering the level of seperation between
different locales in the questions app, this isn't good.

This change is to consider only the current locale when calculating the
percentage the progress bar should be filled.
Re-update django-eadred.

I accidentally in c9f471dd5f960d040e3fb73492a214daf5c620d8.
Make translation actually lazy for realz
Update contributor.ltxt

added some email details and a new link
Tweak the email for contributors.
[bug 838587] Add support for youtube embeds.

This overloads the [[Video:]] wiki tag so that if the you pass
a youtube URL, a youtube embed is rendered to the article.

We need to do this in two steps because we don't allow iframes
in the markup. So we do a first pass by putting in placeholders,
replace the placeholders at the end with the real embeds.
[Bug 847874] Plot topic activity over time.

* Updates elasticutils to add support for histograms.
* Shows volume of questions, broken down by topic.
* Pulls data from ES.
* Configurable date range and bucket size.
* Can reorder and hide topics on the graph.

This commit adds a customized version of jQuery UI. This version of
jQuery UI has the Sortable and Datepicker features. It also has a small
tweak because datepickers were erroring out.

We already have jQuery UI, yes, but it is customized to be a subset.
Adding things after the fact is a PITA, so @rdalal suggested I just make
a new bundle that had what I need in it. It gets bundled with
jingo-minify anyways.
[bug 839248] Track kb article pageviews using the en-US slug.
[bug 839248] Fix case of untranslated document

These don't have a parent because we are passed the en-US already.
s/request.locale/request.LANGUAGE_CODE/
[bug 846756] Add A/B test for product ordering on /products

?b returns the first two products in reverse order.
[bug 839157] l10n remaining email templates

* l10n-ifies the remaining email templates
* adds locale-aware emails_with_users_and_watches
* add rest of email templates to DOMAIN_METHODS
Refactor email sending in wiki

I created a locale-aware emails_with_users_and_watches in email_utils,
so this switches a bunch of the wiki events code to use that.
[bug 839041] Fallback to top articles when there are no search results.
Update docs to reflect our current ES version.
[bug 851070] Fix context creation

This puts the things in the context that need to get rendered in
the email template.
[bug 810529] Implement new get involved page
Limit top contributors to 10 on mobile.
Add media/css/landings dir.
Make the empty directory more like media/css/mobile