add simplified Chinese translation

add simplified Chinese translation based on the traditional Chinese
translation
add layout for simplified Chinese
add links to all pages for simplified Chinese
use YaHei for simplified Chinese
Merge pull request #87 from wayou/gh-pages

add simplified Chinese translation
Add SemVer v2.0.0-rc.1 and v2.0.0  Portuguese-Brazilian translation
add Korean translation
add layout for Korean translation
add links to all layouts for Korean translation
Merge pull request #88 from wendtecnologia/gh-pages

Add SemVer v2.0.0-rc.1 and v2.0.0  Portuguese-Brazilian translation
Merge pull request #90 from hatemogi/gh-pages

add Korean translation
[WIP] add Japanese