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
add PM2 in deployment section fr/en
translate mac installation to french
german translation for pm2
Merge pull request #3139 from keymetrics/gh-pages

Add PM2 in deployment section