Hi there,
Compared to any office writer app (like in LibreOffice) the handling of numbers is different in Scribus as it neither knows a time notation, nor the usual decimal depiction in German.
I would expect a picture like this in German (first column) and English (the second one), both compared to Scribus:
DE EN Scribus 1.6.4
9 9 9
5,034 5.034 5,034
1.201,66 1,201,66 1,201.66
9:15 9:15 9:15
In English only the time depiction is ignored. An improvement would be on my wish list.
In preferences/document setup/general tab is the language set to german?