I would like to use the llncs style for definition, theorems and the like while using polyglossia for typesetting. But when I use both of them, the llncs style will stay in english, instead of french.
MWE (llncs v2.20, compiled with XeLaTeX):
\documentclass[francais]{llncs}
\usepackage{polyglossia}
\setmainlanguage{french}
\begin{document}
\begin{remark}
\end{remark}
\end{document}
I would like to have the same result as when removing the usepackage and setmainlanguage lines.
You can reset the non-English names after loading polyglossia, using the \switcht@[somelanguage] macros defined by the llncs class. Because these macros contains an @ symbol in the name you have to surround the macro call by \makeatletter and \makeatother (see What do \makeatletter and \makeatother do?).
MWE:
\documentclass[francais]{llncs}
\usepackage{polyglossia}
\setmainlanguage{french}
\makeatletter
\switcht@francais
\makeatother
\begin{document}
\begin{remark}
\end{remark}
\end{document}
