There is an ugly warning during "make", it comes from fr.po:
rm -f fr.gmo && /usr/bin/msgfmt -c --statistics -o fr.gmo fr.po
/usr/bin/msgfmt: fr.po: warning: Charset "" is not a portable encoding name.
Message conversion to user's charset might not work.
1453 translated messages, 7 fuzzy translations, 54 untranslated messages.
The attached patch fixes it.