The original is sung by Hanka Ordonowna and is called "Milosc Ci Wszystko Wybaczy", as you pointed out. (it means Love Can Take Everything) It is on a CD called Zlote Przeboje (Golden Hits) by Hanka Ordonowna.
> I'm trying to figure that out myself and I've only come across recognising
> Autumn Leaves/Feuilles Mortes or Milosc Ci Wszystko Wybaczy except
> versions of them I haven't heard.