Different timestamp formatting

Current state (both en and de):

Erstellt am: 8/31/2023, 3:43:30 PM
Gültig bis:  8/31/2123, 3:43:30 PM

Suggestion:

• Use German style date formatting (31.8.2023) or ISO style (2023-08-31).
• Only show the date, maybe show time only as hover text?