[TYPO3-dev] switch default language.

[Stig Nørgaard Færch]

What would it take switch which language is the default language.

Let's say I have a preinstalled site which contains both english and 
german language. English is the default language.
But I only need the german content. So I need to get rid of the english 
content and make german default language.

Could I write an extension to switch which language is default language?
And would the same formular for creating this extension be valid for all 
translation paradigms?

/Stig