Hi,
We didn't answer because your answers were correct and we didn't had much to add.
There is no system to have different prices for different languages in HikaShop.
You can pontentially add a small modification in the index.php of the template or a system plugin to force the currency based on the language and then have different prices for different currencies.
But if you want to have different prices for the same currency for different languages, I don't even see any quick modification to the price system.
Now, everything is possible with coding but it's a big job.
You would have to create custom product fields, one per language to store the price for each language in each product, and then have a custom HikaShop plugin implementing several triggers to override the price of the products and recalculate what's necessary.
For the products listings and the product page, you would have to implement the onHikashopBeforeDisplayView trigger to overrides the prices in $view->rows (listings) and $view->element (product page).
For the cart, you would have to implement the onAfterCartProductsLoad trigger to override the prices of the products in $cart->products .
There shouldn't be anything necessary for the order/invoice/emails.
So with a plugin of around a 100 lines, it's possible. A skilled developer should have no problem doing that with these indications.