Boost based on the currently selected locale.
Merge branch 'master' into search-translated-articles
Fix bug 972533: Enhancements to admin handling of deleted pages.

This adds a new manager to Document, which does not perform any
filtering based on deleted status, and uses that manager for the
admin; this ensures the admin always shows all Documents currently in
the database.

Building on that, the admin filters now include one to show only
deleted Documents.

The admin actions for Document are also updated:

* A new "purge" action is added, to bulk-purge deleted Documents.

* A new "undelete" action is added, to bulk-undelete deleted
  Documents.

* The built-in Django "delete" action is removed, since we want people
  using the standard deletion UI (and because the admin delete action
  bypasses the model delete() method, which is not what we want for
  deleting Documents).
refer to English via a setting
Merge branch 'master' into search-translated-articles
Add search section to 'Site Operations' section.
Store information about the parent document for translated docs.

- Show the parent in the search results.
- Introduce a SiteURLField to simplify rendering it.
- Reindex all translations of a document whenever a doc is rendered.
Use 4 threads to run the celery tasks.
Merge branch 'master' into search-translated-articles
Fix the filtering to do the follwing:

- when in English only show English documents
- when in non-English mode show both language documents as well as English
Reverted some previously removed parts of the result template to better work with the new search method.
Restored some missing code and clarified some other.
Commented in logging setting for elasticsearch again.
Revert log level.
Make the branch work in prod without breaking.
Make selection of links into Quick Links less greedy for toggleable lists.
Fixed anchor is null issue pointed out by @darkwing
Migrate fonts and fonts.css
Merge pull request #2368 from jezdez/search-translated-articles

Boost based on the currently selected locale.
Select dir attribute of root element in RTL styles

This commit removes the .html-rtl and .html-ltr classes and updates all
stylesheets to instead select the dir attribute of the root element.
This leaves us with one fewer value to worry about, which will make
certain types of debugging easier.