doc: dev: Complete contribution.

doc/dev/documentation.org

@@ -291,7 +291,7 @@ Some org-mode configuration used in documentations files are define in
 - {{{file(setup.el)}}}: GNUEmacs configuration to build documentations
 - {{{file(ref.bib)}}}: Bibtex files for documentations files
 
-* TODO How to contribute?
+* How to contribute?
 
 Pamhyr2 is free software: you can redistribute it and/or modify it
 under the terms of the GNU General Public License[fn:license], either
@@ -339,7 +339,44 @@ information for following contribution.
 https://gitlab.irstea.fr/theophile.terraz/pamhyr
 [fn:inrae] The INRAE web site: https://www.inrae.fr/
 
-** TODO Translate
-** TODO Code contribution
+** Translate
+
+You can improve or add translation for the project. To contribute to
+Pamhyr2 translate, you need to use Qt Linguist[fn:qt-linguist]. Open
+Qt-linguist and edite the translation ({{{file(.ts)}}}) file, finally,
+commit the new version of file and make a merge request.
+
+If you want add a new language, edit the script
+{{{file(src/lang/create_ts.sh)}}} like Listing [[ts-it]]. Run the script
+and open the new file with Qt-linguist, setup target language (Figure
+[[qt-linguist-setup]]) and complete translation. Finally, commit the new
+file and make a merge request.
+
+#+NAME: ts-it
+#+CAPTION: Example of modified {{{file(src/lang/create_ts.sh)}}} to add italian (it) translate for Pamhyr2
+#+begin_src shell
+  ...
+  LANG="fr it"
+  ...
+#+end_src
+
+#+NAME: qt-linguist-setup
+#+ATTR_HTML: :width 8cm
+#+ATTR_LATEX: :width 8cm
+#+CAPTION: Qt linguist lang setup example with italian.
+[[../images/Qt-linguist-setup-lang.png]]
+
+[fn:qt-linguist] The Qt linguist documentation web page:
+https://doc.qt.io/qt-5/qtlinguist-index.html (last access 2023-09-18)
+
+** Code contribution
+
+If you are developper you can improve and/or add features to
+Pamhyr2. Please, follow the architecture described in section
+[[Architecture]] as closely as possible. Keep the code simple, clear and
+efficient as possible. The master branch is reserved for the project
+maintainer; you can create a new branch or fork the project before the
+request.
+
 
 {{{biblio}}}