\documentclass[french]{article}
\usepackage[a4paper]{geometry}
\usepackage{babel}
\usepackage[xindy]{glossaries-extra}
\makeglossaries
\newacronym{dvd}{DVD}{Digital Versatile Disc}
\begin{document}
\emph{We are in French} : \today{}.

\begin{itemize}
\item \emph{The following is wrong} : Les \glspl{dvd} sont… Les \glspl{dvd}
  sont…
\item \emph{It should be (note the missing trailing « s »)} : Les DVD sont… Les
  DVD sont…
\end{itemize}
\printglossary
\end{document}


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