I appreciate the web link you sent, but I am sorry to say that I do not speak Polish.
Not only that but I subscribed to that website (Susan, Lotnictwo = Aviation) and one of the moderators just posted a message explaining that the website you quoted only uses the Polish language. Interesting since it's an aviation forum and we, the pilots, speak English wherever we fly, well in most countries that is.
Susan, to answer your questions - I am a commercial pilot in the US, have also flown gliders in Scandinavia. Born in Poland, raised in Scandinavia (several countries) and have lived and worked in the US for almost 20 years.
The forum that was recommended to you is very interesting indeed for anyone with an interest in aviation. Strangely enough it seems to be limited to the Polish language only, I can read it but cannot write in Polish (was a kid when we moved away). Good luck with your book.
Susan, maybe you could sign up for that website (free) and post your request (keep it short and sweet) and ask if someone could translate your request to Polish? My post has been translated by someone but like I said a moderator "reminded me" to stick to Polish...
If they reply in Polish I'll be glad to translate to English (I'm USav8or over there).