Force language

[WouterN]

Hi everyone,

I am looking for a way to force a certain language to a visitor.

Example:
Someone from Holland (.nl) visits my site -> should see the dutch language
Someone from Germany (.de) visits my site -> should see the german language

Now, it's easy for me to find out where someone is coming from. That is not the problem. The only thing I need to know is how I can force a certain language to a visitor.
Is there anyway to do this via a plugin? I have tried several things but I can't seem to find the right solution..

Hope someone knows how to do this.