Reinstall Sharepoint 2013 in a different language

Hi

I have installed a norwegian version of SharePoint 2013 and set up a farm with 2 servers.

I want to change the language to English. Do i have to reinstall SharePoint? And if so; Must I remove the Farm, SQL databases, Webapplications, sitecollections and so on before i reinstall the english version of SharePoint 2013?

There is nothing important on the Sharepoint servers, just a test system for now.

Im a bit unsure how to proceed :-o

best regards :D

Bjørn