wp language core update
Updates installed languages for core.
wp language core update [--dry-run]
Examples
# Update installed core languages packs.
$ wp language core update
Updating 'Japanese' translation for WordPress 6.4.3...
Downloading translation from https://downloads.wordpress.org/translation/core/6.4.3/ja.zip...
Translation updated successfully.
Success: Updated 1/1 translation.