should not escape block.Super

[kohkimakimoto]

This PR changes the block.Super output. Because the output content should not be escaped.

The block.Super in the current implementation returns an escaped content. Please see the following example.

layout.tpl

{% block content %}<h1>Title</h1>{% endblock %}

page.tpl

{% extends "layout.tpl" %}

{% block content %}
{{ block.Super }}
<p>page contents</p>
{% endblock %}

These templates output the following content.

<h1>Title</h1>
<p>page contents</p>

But it is not the same behavior as Django template. The Django official document (https://django.readthedocs.io/en/1.7.x/topics/templates.html) says the following.

Data inserted using {{ block.super }} will not be automatically escaped (see the next section), since it was already escaped, if necessary, in the parent template.

Therefore, block.Super should output content that is not escaped from like the following.

<h1>Title</h1>
<p>page contents</p>

[sonarcloud]

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[flosch]

Thanks for pointing this out and your fix.