[Plugin: Portfolio Post Type] Change name of portfolio

I’m using this plugin and it’s very nice. I only have one issue: to access the list of works I need to set the links to http://www.myweb.com/portfolio but I want to rename the portfolio to something different (ie: trabajos, which means work in spanish), how can I do that? I’m guessing I can easily mess with the code of the plugin but then I’ll have trouble if I update.

http://wordpress.org/extend/plugins/portfolio-post-type/