ist only posssible if you changed following codeline: $productCustom->text = $productCustom->custom_value.''.$price;// CAW CHANGED
(its line 620 in customfields.php) because there was originally an space between $productCustom->text = $productCustom->custom_value.' '.$price; and so the joomla override language variables not work
this must work
jText::_($productCustom->custom_value).' '.$price;