[i18n] update
de: 1065 translated messages, 1 fuzzy translation, 259 untranslated messages.
en: 656 translated messages, 669 untranslated messages.
es: 1325 translated messages.
fr: 1314 translated messages, 11 untranslated messages.
../../doc/book usr/share/doc/cubicweb-documentation
../../doc/html usr/share/doc/cubicweb-documentation
../../debian/cubicweb-doc usr/share/doc-base/cubicweb-doc