Theme Horse

Hi info39,
If you change the code then while updating to our new version all your customisation code will be lost. So we recommended not to change the code.
Just create two file
1> style.css and
2>functions.php

Under functions.php adding this code its correct
<?php load_theme_textdomain( 'interface', get_stylesheet_directory() . '/languages' ); ?>

and under style.css add the below code.

/*
 Theme Name:   Interface Child
 Theme URI:    https://www.themehorse.com
 Description:  Interface Child customization
 Author:       Theme Horse
 Author URI:   
 Template:     interface
 Version:      1.0.0
 Tags:         
 Text Domain:  interface
*/

@import url("../interface/style.css");

Thank you!