Ausgabe der Fußnote bei Verwendung von \footnote{} innerhalb des Arguments von \dictum[]{}

\begin{filecontents}{\jobname.bib}
@BOOK{Stromback1975,
  author = {Stromback, Dag and Foote, Peter},
  shortauthor = {Strömbäck/Foote},
  gender = {pm},
  title = {The conversion of Iceland},
  shorttitle = {The conversion of Iceland},
  subtitle = {A survey},
  address = {London},
  year = {1975},
  publisher = {Viking Society for Northern Research},
  keywords = {secondary, Christianisierung},
  number = {6},
  series = {Text Series},
}
\end{filecontents}
\documentclass{scrartcl}
\usepackage[main=ngerman,icelandic]{babel}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc} 
\usepackage[doi=true,annotation=false,hyperref=true,backend=biber,namefont=smallcaps,style=footnote-dw,idemfont=italic,pageref=true,idembib=true,ibidtracker=constrict,xref=false,idembibformat=dash,edbyidem=true,journalnumber=afteryear,useeditor=true,useprefix=true,editorstring=parens,edstringincitations=true,citepages=permit,urldate=long,xref=true]{biblatex} 
\addbibresource{\jobname.bib}
\begin{document}
\dictum[Winston Churchill (1874--1965)]{Iceland is an unsinkable aircraft carrier available to protect North Atlantic shipping.\footnotemark}
\footnotetext{Zitiert in paraphrasierter Form nach \cite[][127]{Stromback1975}.}
Hier ist ein schöner Text.\footnote{Zitiert in paraphrasierter Form nach \cite[][127]{Stromback1975}.}
\printbibliography
\end{document}