Private AccessPrivate Access
This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.
Set the location of the language directory.
To set directory manually, define the
WP_LANG_DIR constant in wp-config.php.
If the language directory exists within
WP_CONTENT_DIR, it is used. Otherwise the language directory is assumed to live in