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wp_lang_dir › WordPress Constants

Sincen/a
› define( 'WP_LANG_DIR', WP_CONTENT_DIR . '/languages' );
Defined at:

Server path of the language directory.

No leading slash, no trailing slash, full path, not relative to ABSPATH

Source 

define( 'WP_LANG_DIR', WP_CONTENT_DIR . '/languages' );