Friendly Open Source translation community?

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http://www.linuxquestions.org – I have many friends who are interested in finding work as professional translators. It occurred to me that they could get some useful volunteer experience by translating Open Source software and documentation. Most are CS students. They like computers, but Linux is unknown to them. All are fairly fluent in at least 2 languages. Should I recommend any particular Open Source projects for them to join? Do you know any Open Source translation projects that are very friendly and open to working with amateurs? Software that works equally well on Linux and W (HowTos)