smalot/bootstrap-datetimepicker — pull request #253 by shabda (2014-05-22 06:00:44+00:00)
Title: Corrected the lang name for korea

The lang code for Korea is: ko
http://www.lingoes.net/en/translator/langcode.htm

(Kr is county code.)
You could use ko-KR and ko-KP but I don't think it is required in this case.