First off, make sure to select the green beta feedback tab and tell the developers you are in Spanish.
Next, after that clear your cookies and cache on your internet browser. This website is great showing how to clear both in IE, Firefox and chrome. It will be similar for safari and other browsers.
http://its.uiowa.edu/support/article/719
After that, select the world symbol and change your country to "worldwide".
Then select your language as English.
These steps should restore you to English. When they bring new pages to the new white format it causes language issues. Please report back if after follows all these steps, it still doesn't work. Give updates to the green feedback tab (I know, broken record). Developers are rarely here as this is user to user help.