I would like to blesta have such a basic feature, which is:

select language in product url

for example if there is a product:
***************.com/clientarea/order/config/index/shared-hosting/?group_id=1&pricing_id=16

it should be possible to select language for that product, like:

***************.com/clientarea/order/config/index/shared-hosting/?group_id=1&pricing_id=16&lang=fr

which will use French translation in this example.