combine two sentences

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

chapters/packages.tex

@@ -399,10 +399,7 @@ \section{Multilingual Descriptions}\label{multilingual-descriptions}
 Short class definitions do not appear here.
 Texts in such classes belong to the enclosing full class definition.
 
-\begin{nonnormative}
-After the \lstinline!msgid! keyword the text string which shall be translated follows.
-\end{nonnormative}
-It should contain the original string from the Modelica text representation.
+The text string which shall be translated is used as $\mathit{messageIdentifier}$ (following the \lstinline!msgid! keyword), and shall contain the original string from the Modelica code.
 \begin{nonnormative}
 Since in Modelica control sequences also start with a backslash and another backslash is used to use sequences literally or to hide double quotes, no change is required here.
 But Modelica allows strings to go over more than one line, gettext does not.