I'm using Ubuntu 12.04 and NetBeans IDE 7.2.1. My system is set to pt-br, and my NetBeans installation too. I want to use Netbeans in English, how is this possible? I can't find any settings to change the language.
You can try to change the locale settings when you run Netbeans and see if it uses it.
First you need to generate your locales:
sudo locale-gen en_US # or en_GB sudo locale-gen en_US.utf8
Then, from the command line run
LC_ALL=en_US.utf8 netbeans. If this works you can create a new launcher with that command.