@miguelos: It's up to you which version you create. I guess there are not so many territories where polish is spoken, so I suggest to use "pl" instead of pl_PL. If you want, I can change the team for you.
Differentiation makes sense when there are multiple territories/countries speaking slight variants of the same language (like de_DE/de_AT/de_CH, or en_US/en_UK, or pt_PT/pt_BR etc.)
The error message you got is correct. You only signed up for the framework project, not for the gettext one. Apply for a "pl" team in the remaining two projects... ;-)
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