Actually, the author was asked whether Hange is male or female and he didn't answer clearly. However I believe Hange had on a skirt once so very probably it's a she. The translator must have made a mistake.
In the Snk world, wearing a skirt doesn't necessarily mean you're female. If you notice, the soldier uniform is technically a skirt with white leggings, boots, a random top and a jacket.
I read somewhere that the author meant to make Hanji a girl in the beginning, but his assistants said the way he drew Hanji made her look too masculine. He then found it a pain to explain to the mass, and ended up saying that it's up to the reader's choice what Hanji's gender is.
Hmm...Interesting. I don't agree with the skirt doesn't mean female thing though, because I think Historia and even Mikasa wears femine kind of clothes with skirt when they are not in their uniform but I haven't seen the boys wear that.
What I read once was that the author found it amusing that the reader found Hange's gender confusing and decided to leave it a mystery.
I choose to think that Hanji is bigender, and that their bilogical sex is female, but kinda tends to look more masculine than feminine. Just here giving you an idea of uh just my opinion (￣∇￣")!
Throughout the whole manga and anime, I thought that Hange is a female! She is actually a He!