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& symbol shows up as HTML in Calendar

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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** 

feat(alerts): add Matrix support to alerts

5

# 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