Don't know why NetBeans not has an option to choose the user interface language, it use the Windows system language as the default.
It took me a while to figure out how to change the interface language.
1. Temporary Solution
2. Permanent Solution
Go to Netbeans installation directory, for example,
C:\\Program Files\7.1.1\etc
Open "netbeans.conf" and find netbeans default option line
