Fix HTML entities in the event organiser email

Ghost Userrequested to merge
fix/html-entities-organiser-email into master

Closes #625 (closed)

Previous behaviour

Steps to reproduce:

  1. Create an event
  2. Add registration
  3. Enable cancellation emails
  4. Cancel registration

New behaviour

Steps to validate that it works:

  1. Create an event
  2. Add registration
  3. Enable cancellation emails
  4. Cancel registration

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