Can you reformat as:

results = [
    item['err_msg']
    for item in runner.run()
    if not item['result']
]


Also, since we are explicitly not collecting the results and instead collecting the error messages, we should probably call this error_messages or err_msgs.

Undo this.

Swap these so the keys are in alphabetical order.

Django template variables follow the same naming conventions as Python, so this variable name should be in lower_snake_case.

I don't see you using {% static %} anywhere in the template so you shouldn't need to load the staticfiles template library.

Comments should be full sentences (i.e., be sentence case and end in a period).

Indentation is off here. This should be indented as:

    $('#reload-security-widget').click(function(evt) {
        $('.security-center-content-widget').load('feed/security/?reload=1');
        evt.preventDefault();
    });

Also, this should go first in case there is an exception that occurs within $() or $.load.
We also probably want to do evt.stopPropagation() as well.

We are using this variable immediately so let's just inline it.

This should be a rule in a stylesheet.

This should be flush with the first column. We only indent inside the {%   block %}.

And here.

And here.

How about "Run security checks and render the result with the given template." ?

Missing args, returns.

"This widget displays ..."

nit: blank line between these.

We shouldn't need feedtags (or rather, I don't see any tags in use).

error is not even passed into this template. Can an error occur?

We use HTML5 which does not have self closing tags. ie, no / here.

Should not be indented relative to the above line, i.e., they should start on the same column.

Only one space of indentation here.

These need to be marked for translation:

{% if count == 1 %}
{%  blocktrans  %}
1 security issue was found:
{%  endblocktrans %}
{% else %}
{%  blocktrans with count=count %}
{{count}} security issues were found:
{%  endblocktrans %}
{% endif %}

This shouldn't render correctly? .count isn't a thing.
Also why the nbsp?
And this shouldn't need <br> since <div> is display: block by default.

Only one space of indentation here.

Only one space of indentation here.

class="entry"

This has no matching {% if %}. This template shouldn't even be rendering. Have you verified it still works?
You should re-run all testing with each revision.

Can you add a screenshot?

Nit: no blank line here.

This will not work. If you attempt to interpolate a variable var inside a {% blocktrans %} block without doing {% blocktrans with var=... %} it will not render.
Also, we know its 1. Let's just use 1 instead of forcing an interpolation.

There is an extra space between blocktrans and %

There is an extra space between blocktrans and %

If we use {# ... #} we can have the comment not render to the client, which means less bytes over the wire.

Teeny tiny nits :)

Since we're not doing any interpolation anymore, we can use {% trans "1 security issue was found:" %} instead.

Can we add a case where count == 0 to be something like "No security issues were found". In that case we don't need to iterate over err_msgs.

In this case the font colour probably shouldn't be red. I would suggest doing something like:

<div class="summary{% if count > 0 %} has-errors{% endif %}">
...
</div>


and add a .summary { &.has-errors: { ... } } rule in the stylesheet that overrides the colour.

Can you make it so has-errors is the red one?

In your widgets.py you have commas between your list items in your actions list but here you don't. Keep your syntax consistent.