[toupeira]

I still don't understand what's the problem with simply using "you" as second-person plural pronoun, most of the time it's perfectly clear from the context whether it's singular or plural. And if not, there's also "everybody" or "everyone".

In German we have "sie" which is both third-person singular female, third-person plural, and when written "Sie" also a formal second-person singular/plural. It works just fine.