Upper case initial:

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

chapters/packages.tex

@@ -343,7 +343,7 @@ \section{Multilingual Descriptions}\label{multilingual-descriptions}
 \item Template file \filename{<LibraryName>.pot}.
 It contains all necessary information to translate all descriptions, but no translations.
 The pattern \filename{<LibraryName>} denotes the toplevel class name of the library.
-\item one file for each supported language with the name \filename{<LibraryName>.<language>.po}.
+\item One file for each supported language with the name \filename{<LibraryName>.<language>.po}.
 This file is a copy of the associated template file, but extended with the translations in the specified language.
 The pattern \filename{<language>} stands for the ISO 639-1 language code, e.g. \filename{de} or \filename{en}.
 \end{enumerate}