* @return bool|string|void Void if no data exists, extra scripts if `$echo` is true, true otherwise.
*/
public function print_scripts_l10n( $handle, $echo = true ) {
* @return bool|string|void Void if no data exists, extra scripts if `$echo` is true, true otherwise.
*/
public function print_scripts_l10n( $handle, $echo = true ) {