Waiting fix2

• Add manual picking and show picked status
• Make some more text depending on whether you are a student or not
• Make sure manually added students get a Jitsi link too when needed
• Allow admin to see slot overview
• add waiting status to prevent confusion waiting vs pending

added 1 commit

• a6cd07d8 - Do the spotless...

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started a merge train

merged

mentioned in commit 3e812488