First, you will want to learn about how DNN does "localization" to create and manage a multi-language site.
If the second language is a "standard" one, you may be able to find a "language pack" that provides translations for all of the static text in the DNN site. DNNTranslator is a tool that can help you create and/or modify language packs for languages that DNN hasn't provided.
Google Translate is a tool that can automatically translate text from one language to another. You may find this useful, but you'll probably want to have someone fluent in the second language look over the translations. This is for the dynamic content on the site. You'll find some discussion of the Google Translate tool at
http://www.dnnsoftware.com/forums/f...ope/posts. Another option is to use the 2Sexy Content tool (Nice module, terrible name!
) for your dynamic content. It offers several options for multiple languages, including an option to automatically call Google Translate to translate text. That might be an option. See them at 2sic.com and watch some of the videos.