Add portuguese translation of "XP from the Trenches", Kniberg
Add japanese translation of "Scrum and XP from the Trenches", Kniberg
Add chinese translation of "Scrum and XP from the Trenches", Kniberg
Merge pull request #479 from ericguirbal/kniberg

Translated versions of "Scrum and XP from the Trenches" in japanese, chinese and portuguese