Then Magnus posted the right translation.
I have been playing and coaching one of my friends in the game, and apparently those 2 stars, as L0k1 says, are unattainable. It is a bug (probably one that got fixed) and right now those are impossible to get.
So don't worry Julian, your life is complete. I'll keep investigating, but if Lito88 said it is a bug, then it is (as apparently L0k1 is a RL friend of the game developers, so he has insider info... and now I am dying to ask him a couple of questions).