Pontoon: Update Korean (ko) localization of Thimble
Pontoon: Update Korean (ko) localization of Thimble

Localization authors:
- Hyeonseok Shin <hyeonseok@gmail.com>
- Ziqi Zhou <zzhou@miis.edu>
- minwook-shin <minwook0106@gmail.com>

mozilla/thimble.mozilla.org,mozilla/thimble.mozilla.org,mozilla/thimble.mozilla.org,mozilla/thimble.mozilla.org