fix(main-ko) add keyboardShortcuts videoQuality (#8264)
fix(main-ko) add keyboardShortcuts videoQuality (#8264)

* fix(main-ko.json) Update overall korean spelling & words

* fix(_welcome_page.css) update .insecure-room-name-warning_margin-top from 5px to 15px

* fix(_welcome_page.css) initialize .insecure-room-name-warning_margin-top from 15px to 5px

* fix(main-ko.json) add keyboardShortcuts videoQuality
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