Currently they are displayed in descending order of registration date, which is fine. But all not-activated participants shall always be displayed on top.
[x] Backend-Adaption: Order desc, but filter out entries that are not yet activated and insert them at beginning of list
[x] Enhance Backend for providing information about not-activated registrations older than X days in separate structure with necessary information about participant like contact data
[x] Show notification dialog in frontend based upon new backend structure (pops up in Dashboard, user can can select checkbox for not showing information about these participants again. Store all this information in localStorage in browser)
[x] Maybe show similar dialog also when generating teams and/or also before sending dinner-route mails when there are new registrations between team generation and now
Currently they are displayed in descending order of registration date, which is fine. But all not-activated participants shall always be displayed on top.