In role_teacher model, individual students can see their own comments but also teacher's ones, whereas individual students' comments cannot be seen by students.
{% extends "site/layout/base.html" %}
{% load i18n %}
{% block content %}
<h1>500: {% blocktrans %}Server Error{% endblocktrans %}</h1>
{% blocktrans %}An error has occurred.{% endblocktrans %}
{% endblock %}