Translate featured section.
Translate till 2.1
Translate til 2.2.12
Translate till 2.2.14
Translate till 2.3.2.
Finish translation of chapter 2
Translate till audio tag.
Translating layout and rendering...
Finish translation of layouts and rendering
Add some missing translations.
Merge pull request #66 from docrails-tw/layout-and-rendering

Translate layouts and rendering. Closes #29.
Mark layouts and rendering as translated.