In the german version of IIR Cascade Filter with I.C. (CDB).vi and IIR Cascade Filter with I.C. (DBL).vi the objects of the element Filterstruktur of IIR-Filter Cluster should be called "IIR zweiter Ordnung" and "IIR vierter Ordnung".
I do not use any german version of LabVIEW and thus cannot check this issue. But if the problem still exists in 8.5 it is worth posting this issue here.