Macro translations update

Tracked most of the updates to macro documentation.
Omissions are "Changes in Scala 2.11" and the new Quasiquotes guide.

@xuwei-k You've requested that I update the English version of the docs (or at least that's what Google Translate told me), and here we go: https://github.com/scala/scala.github.com/pull/382. Thanks for the catch!