Update chapters/packages.tex

Co-authored-by: Henrik Tidefelt <henrikt@wolfram.com>

chapters/packages.tex

@@ -448,6 +448,17 @@ \section{Multilingual Descriptions}\label{multilingual-descriptions}
 \end{lstlisting}
 \end{nonnormative}
 
+\begin{example}
+An entry for translating the description of \lstinline!Modelica.Math.sin! into Swedish could look like this:
+\begin{listing}
+#: Modelica/Math/package.mo:10126
+#, no-c-format
+msgctx: "Modelica.Math.sin"
+msgid: "Sine"
+msgtxt: "Sinus"
+\end{listing}
+\end{example}
+
 \begin{nonnormative}
 To support the translation of these strings a number of free and commercial tools exist in context of GNU gettext.
 \end{nonnormative}