Preise – ab statt von/bis

function fwkart_variation_price_format( $price, $product ) {
    // Normaler Preis
    $prices = array( $product->get_variation_price( 'min', true ), $product->get_variation_price( 'max', true ) );
    $price = $prices[0] !== $prices[1] ? sprintf( __( '<strong>ab</strong> %1$s inkl. MwSt.', 'woocommerce' ), wc_price( $prices[0] * 1.19 ) ) : wc_price( $prices[0] * 1.19 );

    // Sale Preis
    $prices = array( $product->get_variation_regular_price( 'min', true ), $product->get_variation_regular_price( 'max', true ) );
    sort( $prices );
    $saleprice = $prices[0] !== $prices[1] ? sprintf( __( '<strong>ab</strong> %1$s inkl. MwSt.', 'woocommerce' ), wc_price( $prices[0] * 1.19 ) ) : wc_price( $prices[0] * 1.19 );

    if ( $price !== $saleprice ) {
        $price = '<del>' . $saleprice . '</del> <ins>' . $price . '</ins>';
    }

    return $price;
}
add_filter( 'woocommerce_variable_sale_price_html', 'fwkart_variation_price_format', 10, 2 );
add_filter( 'woocommerce_variable_price_html', 'fwkart_variation_price_format', 10, 2 );