As the TN said, the translations are based on Japanese instead of French. So here's the translation French => English.
Page 2:
-Hé => Hey
Page 3:
-C'est sa robe, n'est-ce pas ? => It's her dress, isn't it?
-Tu as fait ces robes pour lui ? => You did those dresses for him? (actually, it's a typo, should have been "pour elle" and not "pour lui" if the young boy still thinks the cosplayer as a girl)
Page 4:
-Fais un vêtement pour moi ! => Make some clothes for me!
-Je veux un vêtement semblable à la sienne. => I want the same kind of outfit as her.
-S'il te plaît. => Please.