This should be fixed since Vm 2.0.6, but testing VM 2.0.12b and there is a regression!.
Line 872 of customfields.php model file should be
$productCustom->text = JText::_ ($productCustom->custom_value) . ' ' . $price;
Actual bug, preventing custom fields translateable values
$productCustom->text = $productCustom->custom_value . ' ' . $price;