Perhaps someone else could comment on the Portuguese Stack Overflow questions to mention that posting here (this forum) may get them better / faster answers? I don't have enough reputation points to comment there
I have neither, but the Brazilian community communicates over other media:
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Is there another way to reach the (few) people who have been posting to pt.stackoverflow.com to let them know this?
I have no idea; most people that use Plone must be aware of that already.