reformulation

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

chapters/packages.tex

@@ -418,7 +418,7 @@ \section{Multilingual Descriptions}\label{multilingual-descriptions}
 These strings are concatenated when read.
 Note that if a \lstinline!msgid! string is given more than once in the same context, all occurrences are translated with the same (last) translation!
 
-The keyword \lstinline!msgstr! is followed by the translation of \lstinline!msgid!.
+The $\mathit{messageTranslation}$ (following the keyword \lstinline!msgstr!) is the translation of $\mathit{messageIdentifier}$.
 With regard to control characters and line breaks, the same rules apply as for $\mathit{messageIdentifier}$.
 In the template file this string is empty by definition.
 If this is empty in a language specific file the $\mathit{messageIdentifier}$ may be used instead.