let me kindly drive your attention to the bug report
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=997971 . As your online version https://dict.tu-chemnitz.de/dings.cgi?service=de-en&opterrors=0&optpro=0&query=Monat&iservice= is correct, it is unclear to me who is the culprit: dict, the dictionaries your distribute, or the interface the two.
Peter.