GoogleTranslate is a free WordPress Plugin by pokertech which is able to automatically translate your blog in 52 different languages.
Install the google translate plug-in and visit Appearance -> Widgets and drag the google translate button in your sidebar, header or footer.
Google Translate is a free statistical machine translation service provided by Google Inc. to translate a section of text, document or webpage, into another language.
Download Plugin: http://wordpress.org/extend/plugins/googletranslate/