I updated my Ipad 2 to IOS7, as well as some Apps, including Evernote. Now Evenote has turned Chinese? I tried to remove it and re-install but same problem. How can I change it back to english?
Another member was having problems with the Music app's playlists being in German. He went to Settings > General > International and changed his language to French, then back to English. This cleared up his problem.
You should try the same (or similar) and see if it helps.
If this works, it kind of sounds like iOS 7 is having some random app specific localization problems. I'd strongly encourage you to send feedback to Apple on the issue. And maybe the Evernote team too.