function wsa_no_results_message( $attributes ) {
    echo __( 'No auction(s) found.', 'my-language-domain' );
}
add_action( 'woocommerce_shortcode_ending_soon_auctions_loop_no_results', 'wsa_no_results_message', 10, 1 );
add_action( 'woocommerce_shortcode_all_user_auctions_loop_no_results', 'wsa_no_results_message', 10, 1 );