Add csrf token to registration forms

templates/registration/registration_form.html

@@ -9,7 +9,7 @@ registration_form.html | {{ block.super }}
 {% endblock %}
 
 {% block content %}
-<form action="{% url registration_register %}" method="POST">
+<form action="{% url registration_register %}" method="POST">{% csrf_token %}
         {% for error in form.non_field_errors %}
         <span style="color:red">{{ error }}</span>
         {% endfor %}