function my_custom_text( $translated_text, $text, $domain ){
    switch ($translated_text) {
        case 'View cart':
            $translated_text = __('something about Cart', 'woocommerce');
            break;

        case 'Checkout':
            $translated_text = __('Something about checkout', 'woocommerce');
            break;

    }
    return $translated_text;
}
add_filter( 'gettext', 'my_custom_text', 20, 3 );