I have this problem now too. wtf?
I have a different blockchain.info account which is still in engrish.
What to do?
The site remembers the last language you view so if you happened to click on a link to the site in another language that language may stick. It should be easy to revert back though.
On the main site the language is changed by clicking the flag in the top right.
For wallets the language is changed by clicking [Account Settings] -> General -> Language.
If the language still won't change clear your browsers cookies and that should reset everything back to english.