Updated ko.json for koreans tone and manner.
Translated 'the good' as similar meaning of Pros.
Merge pull request #996 from cwdoh/ko.site.string

Updated ko.json for koreans tone and manner.
Fix #982 and revert workaround
Merge branch 'master' of https://github.com/google/WebFundamentals
Merge branch 'master' of github.com:google/WebFundamentals into casestudies