I'm a native English speaker and I can only understand English. For some reason, every email notification I get from the Find My iPhone service (such as a "locked" or "alarm" confirmation) is in French. At least, it looks like French. Before today I've never set my locale to anything other than English on my phone or iCloud.
I tried switching my locale on my iPhone 4 and on iCloud, but the email notifications from Find My iPhone are still in French.