Well I have installed Entity translations and I have enable price field translations (in product type -> Manage fields -> Price -> Field translation - This field is shared among the entity translations. Enable translation).

But I get this error all the time "Notice: Undefined index: amount in commerce_price_field_formatter_view() (line 442"

Without price translation everything is fine but when I'm browsing the product and click at other language the price is still in EUR.