Condenser, the steemit.com web interface, has a few language translations that can be detectable depending on the computer's locale. More languages can be added, it's an open source code, so all contributions are welcome to be submitted on github.
https://github.com/steemit/condenser
https://github.com/steemit/condenser/tree/master/src/app/locales

Also, Golos is the russian equivalent of Steemit, with their own blockchain developed based on steem's code. There's also a korean website (don't remember what it was) that is using condenser, to access the blockchain, with their own translation.