I rarely use financial functions, but discovered today that the function arguments for ISPMT are untranslated (if not intentionally) for the German Excel Version 2016 and for Excel 2010 too.
The Excel Online Help states other argument names than displayed in the Excel function assistant, for example. The online article respectively translates the arguments rate, per, nper, pv to Zins, Zr, Zzr and Bw.
Additionally, the German version of the online article has an error, as it indicates the additional optional parameters [Zw] and [F] in the syntax: ISPMT(Zins;Zr;Zzr;Bw;[Zw];[F]). The two last arguments are not available for this function.