Which template control variant title?

-- HikaShop version -- : 4.5.1

Hello,
I am trying to modify my view templates but I cannot find where the

<span class="hikashop_product_variant_subname">: XXXXX</span>

the file prodcut/show_default.php simply has some php code for where the title is rendered.

Code is actually generated, I want to remove the colon and space but cannot find the correct template!

Please help!