How to translate functions.php?

Added to the functions.php the next:

$pather = get_stylesheet_directory().'/languages';
load_child_theme_textdomain( 'Savia-child', $pather );

And then called it as:

__( 'text to translate', 'Savia-child');

In the child theme I have created a dir: /languages and put there po and mo files with the names: [locale].po/.mp like: ru_RU.po and ru_RU.mo.

That is.