Add template for user deletion confirmation page

apps/userprofile/templates/user/user_delete_confirm.html

+{% extends "base.html" %}
+
+{% block content %}
+<h3>Delete user <strong>{{ user_delete.username }}</strong></h3>
+<form action="" method="post">{% csrf_token %}
+  <p>Are you sure you want to delete user "<strong>{{ user_delete.username }}</strong>"?</p>
+  <input type="submit" value="Delete" />
+</form>
+{% endblock %}