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The Multilingual Press plugin: http://wordpress.org/plugins/multilingual-press/
Pro version: http://marketpress.de/product/multilingual-press-pro/
On a side note: If you’re like me and you’re not familiar with the french language, just pasting the “P” word into Google Translate might leave you somewhat puzzled. However, this is a perfect example of how multilingual content in general needs to be curated with extra care regarding cultural aspects. While “p…” certainly is a slang word, I’ve been reassured it does not at all have the strong connotation it would have in English or German, and that it is very commonly used as an expression of hearty amplification.