Add missing template.

biscuit/core/templates/core/edit_person.html

+{% extends "core/base.html" %}
+{% load bootstrap4 i18n %}
+
+{% block page_title %}{% blocktrans %}Edit person{% endblocktrans %}{% endblock %}
+
+{% block content %}
+
+ <form method="post" enctype="multipart/form-data">
+  {% csrf_token %}
+  {% bootstrap_form edit_person_form %}
+  <input type="submit" value="Edit" />
+ </form>
+
+{% endblock %}