Update Korean language #20
Merge pull request #64 from EngForDev/ko

Update Korean language #20
Update Gemfile

Add secure source for gemfile
Merge pull request #67 from lucianosousa/patch-1

Update Gemfile
issue #65 Add links swich different languages
Fix typo
Merge pull request #70 from EngForDev/language_links

issue #65 Add links swich different languages