Our Sitecore DB items had many of their display names changed to Japanese for no apparent reason. We thought that we might have accidentally changed the Sitecore language in the content editor, but I can confirm that it is in fact English. This seems to only be happening in the core DB. Has anyone had something similar happen?
Here is an example of the display name changing:

Here is a confirmation that we are set to English:

We're on Sitecore 7.5