Installer /activer les fichiers de langues.

                    # Installer la langue française
# wp language core install {lang}
wp language core install fr_FR

# Activer le package francais
# wp language core activate {lang}
wp language core activate fr_FR

# Installer le package de langue français pour le theme twentyseventeen
# wp language theme install {theme} {lang}
wp language theme install twentyseventeen fr_FR

# Installer le package de langue français pour le plugin akismet
# wp language plugin install {plugin} {lang}
wp language plugin install akismet fr_FR