Use bleach to prevent escaped characters in event card

Ghost Userrequested to merge
fix/446-check-escaping into master

Closes #446 (closed)

Previous behaviour

Steps to reproduce:

  1. Open thalia.nu
  2. Scroll naar beneden naar "Aankomende evenementen"
  3.   in text

New behaviour

Steps to validate that it works:

  1. Open thalia.nu
  2. Scroll naar beneden naar "Aankomende evenementen"
  3.   is unescaped in text
Edited by Ghost User

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