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**Describe the bug** `&` shows up as `&` in Calendar event preview. **Where did it happen?** Occurs on Firefox on cryptpad.fr. **Screenshots** ![Screenshot_20210527_200034](https://user-images.githubusercontent.com/67550725/119815444-0ff8a200-bedb-11eb-8383-ab9604bad4fa.png)

bug
Calendar

# Description This PR adds an alert for [Matrix](https://www.matrix.org/). Matrix is a decentralized messaging platform that allows to allows other applications to send messages via a webhook. ## Type of...

For GameServerManagers/LinuxGSM#3507