One day we plan to add full internalization support to Podpage, so the entire website can be changed to a different language. Until then we've added some enhanced customization to be able to change the navigation bar and some of the core words that appear throughout the site. This should get your site 90% there, and we're working to add the extra 10% soon.
To change a lot of the core words on your website, edit the Navigation Bar Links on your website ("About", "Episodes", etc...). These will not only change these words here, but also throughout the rest of the site.