Allow override of "email key" for user feedback, sent via API

tailbone/api/common.py

@@ -41,7 +41,13 @@ from tailbone.db import Session
 class CommonView(APIView):
     """
     Misc. "common" views for the API.
+
+    .. attribute:: feedback_email_key
+
+       This is the email key which will be used when sending "user feedback"
+       email.  Default value is ``'user_feedback'``.
     """
+    feedback_email_key = 'user_feedback'
 
     @api
     def about(self):
@@ -94,7 +100,7 @@ class CommonView(APIView):
                 data['user_url'] = '#' # TODO: could get from config?
 
             data['client_ip'] = self.request.client_addr
-            send_email(self.rattail_config, 'user_feedback', data=data)
+            send_email(self.rattail_config, self.feedback_email_key, data=data)
             return {'ok': True}
 
         return {'error': "Form did not validate!"}