Please install and activate the supplied child theme, inside the child theme create a new folder structure /woocommerce/loop/. Inside that create a new file: result-count.php.
Inside this file paste in the code found here: http://pastie.org/private/esakgudvkflwjppvz3aldg.
Inside that code, locate and change the text here:
if ( 1 == $total ) {
echo __( 'Showing the single product', 'swiftframework' );
} elseif ( $total <= $per_page ) {
printf( __( 'Showing all %d products', 'swiftframework' ), $total );
} else {
printf( __( 'Showing %1$d-%2$d of %3$d products', 'swiftframework' ), $first, $last, $total );
}
.