Change word "SKU" to "Code"

-- url of the page with the problem -- : prosklitiria4u.gr
-- HikaShop version -- : Business 2.4.0
-- Joomla version -- : 3.4.0

Hello

Please I want to change in the product page the word "SKU" with "Code" or in my mother lang and also the word "Categories". Is it possible?

Dear sir

Thanks for the response
I did what you told me but I cant manage it
I install the greek lang (joomla & hikashop) but only some thinks are translated.
for example for the word "categories" in the product page , thre is translation in the .ini file but its not translated...or for SKU but nothing
Can you help me a little more. I will sent the credencials in private message just in case you have the time to help me.

Hello,
Note that if it's not translated through your Greek language file you'll just have to add your translation word.