Pontoon: Update Korean (ko) localization of Firefox
Co-authored-by: Kim YoungCheon <circcc@gmail.com>
62a62aed940f6e4007111bbd9405fc7ed041d139 THUNDERBIRD_3_0b1_RELEASE
62a62aed940f6e4007111bbd9405fc7ed041d139 THUNDERBIRD_3_0b1_BUILD1
873ef85a63aac1e52a167a8b0236ac96dc2cebb1 GECKO_1_9_2_BASE