There is no option to hide products based on the current language however there is a way.
If you create one hikashop category menu item per language and that you associate each with a specific product category, you can have different category trees (one per language) and then add the products to their categories for each language.
So your category tree would be:
computers (en)
- laptops
- desktops
- tablets
Ordinateurs (fr)
- portables
- fixes
- tablettes
And when you have a laptop that you sell to both en and fr you add both laptops and portables categories to it, but if you sell it only to the fr market, you only add the portables category to the product.
That way, when you switch the language, the menu items will change based on the languages.