I tried out the Chinese, and couldn't get it back! Here's what I did to fix it:
Go to preferences, and select the topmost entry in the top list. This is English. Go to the bottom and select the button, which saves things. Then get out of VMF. Go to your cookie manager and delete any vintage-mustang cookies. Close your browser and open it up again. Type in www.vintage-mustang.com, and login manually. That resets your cookies and you should be in business again.