We’ll let you specify your blog’s primary language soon.
When we figure out how to make it cover all the strings, we’ll look into translating the interface. But it gets complicated because we can’t effectively support or monitor blogs that we can’t read.
That’s true, it gets complicated (special in support). But we can perfect it with user interface. I believe if we can allocate template management sections to users, it will be sufficient at first blush.
Update: Read this entry! :)