Define Standard Language

[itsmeee]

How do I define the standard language of my site. I set my first language to english. Every other language has a suffix _de, _it, _fr

My problem is: If there is no content for the french or italian version of the site I want to display the english version.
In my case it displays the german version if the french or italian one are empty, even if the english version is my main language. How can I change this?

thanks