When hovering over the tray date, an info box appears in german and english:
In my language settings all is set to german.
The “Thursday” is doubled, since it already says “Donnerstag” below.
Are there other places where I can configure this dialog?
Settings → Region & Language
Try setting German for time, see if it helps
Same here. LOCALES already had been set to German.
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In the language dialogue the time (and all other) settings are set to country “Deutschland”.
Unfortunately, in the language settings I don’t have any further options to specify some formats. Then I would set the year format to four digits (2024 instead of 24).
So I assume that there are other places where I can set this. I’ve found the mini program “digitalclock”, which probably shows this display, but I have no idea where to adjust the settings there.
You can set it via
RMB on clock → Configure digital clock → Appearance → Time display / Date format
Thanks. The settings dialogue for this was too small, so I didn’t see the scroll bar. 
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I think the hover dialog is simply not fully translated or adapted until now.
For a consistent translation, the “CET” should also be translated into “MEZ” or “MESZ”.
So let’s pass the buck to the KDE team. 
I don’t know, that would be really weird…german is a very popular language for that to be not fully translated… 