Merge branch 'fix/add-bleach-events' into 'master'

Add bleach to events

Without bleach filtering the description text, it is possible for administrators to add any HTML they want to the description.

See merge request !164

website/events/templates/events/event.html

 {% extends "base.html" %}
-{% load i18n static %}
+{% load i18n static bleach_tags%}
 
 {% block title %}{{ event.title }} — {% trans "Calendar"|capfirst %} — {{ block.super }}{% endblock %}
 
 {% block body %}
     <h1>{{ event.title }}</h1>
-    <p class="tcenter">{{ event.description|safe }}</p>
+    <p class="tcenter">{{ event.description|bleach }}</p>
 
     {% if messages %}
         {% for message in messages %}