Translation in child theme

More info:
I tried to use the method of loading child theme textdomain as described here:
http://codex.wordpress.org/Function_Reference/load_child_theme_textdomain
, but could not figure it out, how to include it exactly.
I created the funtions.php file, and put there this code:

<?php
function my_child_theme_setup() {
	load_child_theme_textdomain( 'customizr-child', get_stylesheet_directory() . '/lang' );
}
add_action( 'after_setup_theme', 'my_child_theme_setup' );
?>

but it does not work. Probably i made a mistake somewhere…

Please help! )