Correct typo and and add Korean translation.
Add Korean translation for installation/index.md, linux.md, mac.md, windows.md.
Update deploy.md
add translation of ko.
Add Korean translation.
Add Korean translation of mail/index.md
Add translation of quickstart.
Add Korean translation of theme (incomplete).
update ko/themes/index.md
Add Korean translation of theme (incomplete).
Merge raon0211's work with mine.
Merge raon0211's work with mine.
Merge raon0211's work with mine.
Merge raon0211's work with mine.
resolve conflict.
Merge pull request #2997 from ntalbs/gh-pages-ko

Korean translation