link to translated product is not working

-- url of the page with the problem -- : chicmouda.com/index.php?option=com_conte...d&Itemid=233&lang=ar
-- HikaShop version -- : 2.5.0
-- Joomla version -- : 3.4.3
-- PHP version -- : 5.5.12

hi,
I installed falang to translate the content of hikashop (products and categories). I translated some products, and they are well displayed in english and arabic but if I click on arabic product it send me to the product in english.
I attached you a pic, as you can see the link displayed on the bottom when I scroll the mouse over arabic product is in english. how can I fix this problem.
thank you