I saw vi_VN in Demo site but couldn't use it, maybe you didn't allow changing admin profile how can I check it?

Two accounts used for demo used are read-only, you can't change profile of them.
But you can create new admin accounts, login with the new one and test vi_VN translation.

Yes, we havn't integrated it yet, and we didn't say we already integreated it anywhere.

Not ready yet, but it will be available soon. Just be patient

In demo site, there isn't the ftp options when create account.

Ah, I couldn't use the link "Buy now" to buy the iRedAdmin Full-featured Edition. I want some info, specially the price