Add a 'next' hidden field to allow form to store redirection url

apps/common/templates/generic_form_subtemplate.html

@@ -30,6 +30,10 @@
         {% if submit_method != "GET" and submit_method != "get" %}
             {% csrf_token %}
         {% endif %}
+        
+        {% if next %}
+            <input name="next" type="hidden" value="{{ next }}" />
+        {% endif %}          
 
         {% for hidden_field in hidden_fields %}
            {{ hidden_field.as_hidden }}