there, I?m trying to load a language-file for my

Hi there,
I´m trying to load a language-file for my child-theme, but it doesn´t work:

What I´ve tried:

1. Add de_DE.po / de_DE.mo Files to a /language Folder of my child theme

2. Add a functions.php to my child-theme-Folder

3. Add the snippet:

'<?php function my_child_theme_setup() {
load_child_theme_textdomain( 'PARENT-NAME', get_stylesheet_directory() . '/languages' );
}
add_action( 'after_setup_theme', 'my_child_theme_setup' );
?>'

Unfortunatly, nothing happens.
What is going wrong?
Thank you
Cheers
Marco