* django-ratelimit 1.1.0 → 2.0.0: Fail open on missing cache, drop
  support for Django 1.10 and earlier, add support for Django 2.0 and
  2.1.

Remove file attachment data from the KumaScript API. This avoids
creating a header that exceeds 8K bytes when a page has several
attachments.

bug 1520574: Remove file data from the KumaScript API

bug 1518653: Update to django-ratelimit 2.0.0

…1509430

bug 1509430: memcached service no longer used by travis

bug 1518482: remove some docs from sitemap

…to-github-link-bcd

Bug 1522441, switch back to Github link from survey for BCD

Update submodules

This is now included in the base template for all wiki pages.

* Add "Try it live!" for new embedded Codepen examples

bug 1521135: Add codepen to CSP allowed script-src

Update strings 2019.01

Kuma's render_stale_documents task splits the list of stale
documents into groups of 5, then re-renders each group in
parallel. This typically causes about 12 requests to the KumaScript
server at the same time, causing load spikes that only occur
once an hour when this task runs.

This patch changes the task so that the subtasks for each group
of documents are chained and run in series instead of in parallel.
This should reduce the load on KumaScript and enable us to drop
down to a single KumaScript server.

…ue-tests

Bug 1522445, move Jest and True tests to existing tests directory

[Bugzilla 1522385](https://bugzilla.mozilla.org/show_bug.cgi?id=1522385)

This PR overrides global `font-style: normal !important` of following locales, for `.syntaxbox > var` and `.syntaxbox > em`.

```
ja
ko
zh-CN
zh-TW
```

Why: To mark that certain keywords are programmer-specified contents, and can be changed.

Related issue: [973171: Don't use italic text in CJKT pages](https://bugzilla.mozilla.org/show_bug.cgi?id=973171)

Bug 1522718: render stale documents in series, not in parallel

bug 1518482: nofollow links to user profiles

update sub-modules