Some more information on this topic can be found in the thread "Non-English posts on Perlmonks". I'm a little surprised you missed the discussion--It was very heated ;)

The idea, as far as I'm concerned, is to increase knowledge about Perl. Most people find it easier to learn in their own language. The reason Portuguese is being indexed here is because the Portuguese-speakers at the Monastery are active in this regard. If you would like to translate something, then I personally would encourage you to do so.

I hope that answers your questions.

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Allolex