I've just watched this, and I can heartily recommend it. Very well paced, mostly very quiet and tense. The ending was surprising, but rang true, life can be just like that!
As regards extras, I haven't watched the Making Of yet, but the one with the director speaking of his approach to film-making was very much to my liking. And he does refer to the two meanings of the French word Revanche, as adopted and used in German - revenge and also, in some contexts, another go or chance.
I didn't check out how many subtitle languages there are, I just watched the good English ones.
Beware the spoiler in another review here, and just get this film, it's a classy piece of work. Unless of course you prefer big bang Hollywood action.