I just had the same problem, and made it work. It seems that the translations have use same textdomain as the parent theme. You need to translate both the “swiftframework” domain, and “woocommerce”.
This works for me, loading the same translations twice …
<?php
function my_child_theme_setup() {
load_child_theme_textdomain( 'swiftframework', get_stylesheet_directory() . '/languages' );
load_child_theme_textdomain( 'woocommerce', get_stylesheet_directory() . '/languages' );
}
add_action( 'after_setup_theme', 'my_child_theme_setup' );
?>