Thanks Mistywing. I know there has been several threads arguing about the right segmentation of the episodes, and it's not my point here. (Even though I think TVDB should follow the chronological order when the channel airs the episodes in obviously the wrong order, for marketing reasons.)
The mistakes I noticed in this case are about the pictures and a French summary that doesn't match the right episode. The French summary of "Day of Ashes" tells the plot of "The last hunt". The correct summary should be:
"Les vendanges sont menées par une secte du nom des "Vendangeurs de Dieu", dans le domaine dit du Château. C'est là-bas qu'on retrouve, dans une chapelle, sous les gravats d'un mur, le corps de Samuel Toschi, restaurateur des fresques de ce sanctuaire religieux. Cette fois-ci, Camille, infiltrée, enquête de l'intérieur. Niémans, lui, comprend que le tueur cherche à éliminer les têtes pensantes des gens du Château. En se rapprochant de la vérité, les flics vont découvrir la véritable nature de cette secte et leur projet terrifiant... "
And I think the pictures in "The last hunt" and "Day of Ashes" have been swapped: each one should match the other episode.
I also would have liked to develop a little bit each French summary (that's why I wrote them down in a previous post) but that's not really a mistake, just a lack of information, so it's not so bad.

Thanks!