Translation problem

Hi
I mahe a child theme to Vantage and create language folder with my own translation to romanian (ro_RO.po and ro_RO.mo) but my theme is the same în english. I try with functions.php like I see on internet but dont work. Where I’m wrong?
functions.php from child theme is

<?php
// Make the theme translatable
//load_theme_textdomain( 'portal', get_stylesheet_directory() . '/languages' );

function vantage_child_setup(){
load_theme_textdomain( 'vantage-child', get_stylesheet_directory() . '/languages' );
}
add_action('after_setup_theme', 'vantage_child_setup', 15);
?>