Resolve "Use Select2 everywhere"

Closes #102 (closed)

TODO: Do not load any stuff from external sources.

biscuit/core/templates/core/edit_group.html

@@ -3,6 +3,9 @@
 {% extends "core/base.html" %}
 {% load bootstrap4 i18n %}
 
+{{ form.media.css }}
+{{ form.media.js }}
+
 {% block bootstrap4_title %}{% blocktrans %}Edit group{% endblocktrans %} - {{ block.super }}{% endblock %}
 
 {% block page_title %}{% blocktrans %}Edit group{% endblocktrans %}{% endblock %}