You can become a translator by going to the Documentation and clicking on Translate on any of the docs.
I'll attach some screenshots so you can see...

And if you mean translator for software, since Libre Software is not one but many. You can use these sites for translating programmes (localisation)

https://launchpad.net/
http://pootle.translatehouse.org/index.html
http://zanata.org/

I've helped translate projects like Tor, Midori, MATE over the years... I hope this is useful for you! :D

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