urlize_quoted_links filter is not registered correctly

[dkliban]

Steps to reproduce

Put the following in a template:

{% autoescape off %}{% for key, val in response_headers|items %}
<b>{{ key }}:</b> <span class="lit">{{ val|break_long_headers|urlize_quoted_links|my_filter }}</span>{% endfor %}

</span>{{ content|urlize_quoted_links|my_filter }}</pre>{% endautoescape %}
</div>

Expected behavior

my_filter receives unescaped input text

Actual behavior

my_filter receives escaped text

I've put together a PR for this issue. #6191

[dkliban]

@tomchristie Please take a look at this issue. I made the PR based on the documentation from django[0].

[0] https://docs.djangoproject.com/en/2.1/howto/custom-template-tags/#filters-and-auto-escaping

[rpkilby]

Somehow this was detached from the milestone.. either way. PR was added, so not an issue.