Bug 1030767 - Create Admin List View with filters

This template can be better formatted to be more readable. I generally prefer to break as much as possible to make it readable, and I don't care about the results html readability since the browser doesn't care either.
E.g.
``` 
{% if header.sortable %}
    <a href="{{ page_url(request, page_obj.number) }}{{ header.url|escape }}">
{% endif %}
```