How delete the " : " from filter place

-- url of the page with the problem -- : kosmima-gkiotli.gr
-- HikaShop version -- : 2.6.3
-- Joomla version -- : 3.6.0
-- PHP version -- : 5.4.45
-- Browser(s) name and version -- : Firefox 47.0.11

Hi,
I want to add a filter on my page but is appears a " : " char like is appears on image that I attached, and I don't know where is the code to delete the specific char.
I have made a copy of "mod_hikashop_filter" in joomla , like is appears on image 2 but I can't find something. What can I do?

Thanks in advnace

Thank you!