Turkey made a great effort and we were even better than the Germans. The referee really tried to make the Germans win. But I love the Turkish national team very much, whether they win or lose!
kfeto, "either they win or they lose" or "either winning or losing" are the best choices here, we are not establishing a condition. We are saying that "I love ...in any situation, when they win and when they lose" Right?
So, that "when...or...when" means "either...or" not whether.
no lilian, you can say whether "to establish a condition" and then cover both options to indicate you love them no matter what the outcome.
in fact this is also done in the original but that doesnt really matter, what matters is in english it's possible to do this