You don't have to worry about duplicate content issues either. It's all unique content that the search engines love. More content equals more traffic. 64.8% of the world is surfing the Internet in a language other than English. By translating your website into other languages, you immediately open up a stream of new markets and increased traffic from foreign search engines.
The competition in foreign language search engines is much less than in the English search engines.
Here is a Wordpress plug-in called Simple Thoughts. This plug-in uses automatic machine translation to translate your blog into eight languages - Spanish, French, German, Portuguese, Italian, Japanese, Korean, and Chinese.
You can download this plug-in at: http://blog.taragana.com