Hi,
This bug already exists in VM 2.0.26D bug is still there in VM 2.6.22
If you use language overrides in a multilanguage site custom fields don't get translated on the product details page in frontend.
To solve this
administrator\components\com_virtuemart\models\customfields.php
CHANGE on line 1000
$value = $customfield->custom_value;
TO
$value = Jtext::_($customfield->custom_value);
Jeroen