Hi,
We added translation capabilities where it was necessary to not clog the interface where it's not necessary.
HikaShop is meant to be used to sell products.
Seblod is meant to be used as an all rounder which can do anything and everything. And thus, it doesn't know where it makes sense to propose the translation capability or not since it doesn't know the purpose of the fields you're creating.
That's the main difference between CCKs and specialized software. With a specialized software, it has preset interfaces optimized to do one thing (for hikashop, it's to sell your products). With a CCK, it has generic interfaces which can do anything.
So the CCK will require more time to configure to do something, but it can do things in more areas.