Q: iTunes 11.4 is mysteriously displayed in Chinese. How do I change back to English? Using OSX 10.9.5.

Everything, or only song names?

iTunes: Changing the display language - http://support.apple.com/kb/HT2242 - "Follow the steps below tho change the language displayed in iTunes and also the language displayed in the iTunes store."

Or, go to the iTunes Store, scroll all the way to the bottom and look in the lower right. Is there a USA icon showing, or a Chinese icon? Chances are it is a Chinese icon. Click it and change to the USA Store. All the displays should change to English.

Try reinstalling iTunes. That means just installing iTunes form the Apple website. it should replace your old iTunes, and your old settings. I do not think content is deleted, but you may wish to check or make a backup.

No prob! Happy to help If the issue comes up again, continue re-installing. Apple should address this glitch/bug in the next update.

I did that and it still shows in like Chinese.  My albums are in English it is like the tabs and anything you need to choose