Hi,
I modified the class product like Nicolas has suggested.
Here's the code
$separator = JText::_('HIKA_VARIANT_SEPARATOR');
if($separator == 'HIKA_VARIANT_SEPARATOR')
$separator = ': ';
$variant->product_name = $variant->main_product_name.'<span class="hikashop_product_variant_subname">'.$separator.$variant->characteristics_text.'</span>';
This modification would be include in the next package of HikaShop.
Best regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.