The User Guide for Linux Mint 5 Elyssa was translated in Greek (by Marlene, Grimm, Twin and Ippokratis) and in Catalan (by wuying_ren). Links to both versions were added to the Elyssa Firefox start page.
You can also access the user guide from here: ftp://ftp.heanet.ie/pub/linuxmint.com/stable/5/user-guide/
Edit: Thanks to sdemchenko, it’s now also available in Russian.
Edit: Thanks to http://linuxmint-italia.org/, it’s now also available in Italian.