add_action( 'plugins_loaded', 'myplugin_load_textdomain' );
/**
 * Load plugin textdomain.
 *
 * @since 1.0.0
 */
function myplugin_load_textdomain() {
  load_plugin_textdomain( 'my-plugin', false, basename( dirname( __FILE__ ) ) . '/languages' );
}