Jitsi link generation broken with unusual names
# Summary
<!--Describe the bug in short here. Describe what happens that is considered
bad behaviour.-->
When a students with an unusual name (e.g. with a `'` in the name) creates a new request with an automatically generated Jitsi link, this link will give a 404.
# Steps to reproduce
<!--Describe the steps required to reproduce the bug. An enumeration with screenshots
is preferred to be able to easily reproduce.-->
1. Login with a user which has `'` in the name.
2. Create a new request which has Jitsi as room.
3. Enter the generated Jitsi room and see the 404.
# Possible Fix
<!--If you have a suspicion of what might be wrong, describe what you
think is going wrong.-->
Remove all the alphanummeric characters from the name before using it to generate the Jitsi room name.
# Logs
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<description><code>
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issue