Fix a number of small (but important) issues in the admin interface

Fixes a number of issues in the admin interface including:
* Certain forms (for actions) were not being rendered
* Fixed link to user bounce message
* For template email to user for vexatious requests:
  * Don't hardcode WhatDoTheyKnow.com
  * This template email (and the subject) can now be internationalised
* Escaping fix for the display of events params_yaml