Little, easy improvements

I didn't figure out github yet (where to leave a message)..

Not to nit-pick, but Ref: DjangoBook 2.0: It seems that each chapter (starting with chapter06) has a broken link at the bottom of the page. To wit: the orange link "next page" within the text.

For example, chapter06 has the link: "​http://www.djangobook.com/en/chapter07/" but it should link to "​http://www.djangobook.com/en/2.0/chapter07.html"

I thought I'd drop a line since that's what I see on Djangobook.com