Korean localization
Korean localization

Add Korean localization.
But I couldn't check 'yesterday', 'last week'.

colemancda/FormatterKit,iMokhles/FormatterKit,sebastianludwig/FormatterKit,revolter/FormatterKit,twobitlabs/FormatterKit,hodinkee/FormatterKit,BluechipSystems/FormatterKit,Elethom/FormatterKit,zhaoguohui/FormatterKit,twobitlabs/FormatterKit,mattt/FormatterKit,twobitlabs/FormatterKit,zhou18520786640/FormatterKit,mattt/FormatterKit,t089/FormatterKit,mattt/FormatterKit,boherna/FormatterKit,otaran/FormatterKit,cnbin/FormatterKit,bizz84/FormatterKit,tevelee/FormatterKit,Elethom/FormatterKit,NghiaTranUIT/FormatterKit,neoneye/FormatterKit,iv-mexx/FormatterKit,gaurav1981/FormatterKit,algal/FormatterKit,otaran/FormatterKit,otaran/FormatterKit