JavaScript Patterns in Action SPA app is in spanish

The content in the JavaScript Patterns in Action Single Page App is in Spanish. Is there a specific reason for this and is there an English version?> 

Hello David: 

This is rather curious because the application was written in English and there is no Spanish version...
You may want to look into your browser, perhaps you have some language configuration or translate feature enabled?

Let us know what you find, so we may help users who encounter a similar issue in the future. 

Jack