I'm running hudson.war through the command line. It launches the interface in my default language, portuguese. How can I change to english?
Depends on what you want:
If you want to change the language only for yourself, change the browser settings.
If you want to change it for everyone, there is a plugin for that.
As far as I know, you have to change browser language.
Chrome (Mac) > Preferences > Under the Hood > Web Content > Languages and Spell-checker Settings...
Internet Explorer > Tools > Internet Options > General > Languages
Jenkins shows the Web interface in whatever language your web browser asks. If you are not happy with the language, you need to change your web browser settings.
来源：https://stackoverflow.com/questions/8659578/how-to-change-hudson-default-interface-language