fix: correct German date format token for dayjs in de-DE translation (#25985)

TT and JJJJ are German placeholders but not valid dayjs format tokens.
Replaced with DD and YYYY which dayjs understands correctly.

src/lib/i18n/locales/de-DE/translation.json

@@ -519,7 +519,7 @@
 	"Datalab Marker API": "Datalab Marker API",
 	"Date Modified": "Datum geändert",
 	"Day": "Tag",
-	"DD/MM/YYYY": "TT.MM.JJJJ",
+	"DD/MM/YYYY": "DD.MM.YYYY",
 	"DDGS Backend": "DDGS Backend",
 	"December": "Dezember",
 	"Decrease UI Scale": "UI-Skalierung verringern",