Change every mention of the word portfolio to partner in wordpress


I'm waiting for an answer from the theme developers, but thought i'd drop the same question here too...

I am working with a theme template that provides a portfolio plug in. I would like to change every mention of the word portfolio to partner. So in all url's, in the admin menu panel and obviously any code within the theme/word press files that refer to portfolio.

Is this possible? and if so what would be the best approach?

The project is currently a single wordpress install, but at a later date it is likely to be converted to a multisite install and may also have eccomerce functionality added.

Many thanks