Trouble translating a Child Theme

you must have to enque your parent theme first.

function load_parent_stylesheet() {
 wp_enqueue_style( 'parent-styles', get_template_directory_uri() . '/style.css' );
}
add_action( 'wp_enqueue_scripts', 'load_parent_stylesheet' );

Then load your translation folder

function my_theme_lang_setup() {
 $lang = get_stylesheet_directory() . '/languages';
 load_child_theme_textdomain( 'your-domain', $lang );
}
add_action( 'after_setup_theme', 'my_theme_lang_setup' );

Put this in your function.php and try