@camilla: yeah, and that’s why I warned about that before someone considers to register here (despite they are a registered financial organisation in Poland). However if you get to the home page you’ll be greeted with suggestion to move to their international version, allowing people to donate in EUR. (If it does not show up, it’s 4fund.com.)
I think most if not all Polish bank accounts do support payments in euro (at least via currency conversion), but it’s strongly recommended to consult this with your bank beforehand.