I'm typesetting a book with memoir class and in this book the parts have to be centred in the table of contents (TOC). Thanks to Center parts in toc with tocloft I got this working as long as the part name isn't longer than one line. But if it is longer, the second line is not centred. Here is a working example:
\documentclass[a4paper,10pt,twoside]{memoir}
\usepackage{polyglossia}
\usepackage{blindtext}
\usepackage{fontspec}
\makeatletter
\renewcommand{\partnumberline}[1]{\hfil\hspace\@tocrmarg Teil #1:~}
\makeatother
\renewcommand{\cftpartfont}{\large\normalfont}
\cftpagenumbersoff{part}
\begin{document}
\tableofcontents*
\part{It works with one liners}
\chapter{Test}
\Blindtext
\section{Test124}
\Blindtext
\part{But it does not work with those: That is only a test nothing more, please do not read it}
\chapter{Test2}
\Blindtext \Blindtext \Blindtext
\end{document}

What could I do to get all lines centred?