Wordpress - Calendar language

Hi you all…
I need some help in here. I’ve recently installed wp in one of my websites that’s writen in portuguese. So, I would like to have all my features in portuguese language. Could someone tell me how to change calendar months and days from english to portuguese? What files should i have to edit?

Thank you all.

You’ll have to change your localization, though I have no idea how to do that. Here’s the wiki page: http://wiki.wordpress.org/?pagename=WordPressLocalization and here’s a forum topic on that as well: http://wordpress.org/support/3/8852