wp-admin/includes/class-wp-filesystem-base.php:138Returns the path on the remote filesystem of WP_LANG_DIR.
string|false public function wp_lang_dir() { return $this->find_folder( WP_LANG_DIR ); }Introduced in 3.2.0. One change between 6.7.7 and 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
string to string|false.verified against sourcesrc/wp-admin/includes/class-wp-filesystem-base.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.