ui: Korean language support for all features of the new CloudStack UI. (#4916)

This PR includes fixes to complete the Korean language support of the new CloudStack UI.

CloudStack explains that it supports Korean, but only some features are translated. Compared to the en-us.json file, it is not up to date on new features.

To support Korean language support for new features and more modern Korean language support, the contents of en-us.json were copied to the ko-kr.json file and retranslated into Korean.

Co-authored-by: Dajeong-Park <ekwjd7182@gmail.com>

Author: DH Park