Update Korean translation (#3256)

Update Korean translation (#3256)

* Update validation.php

* Update activities.php

* Update passwords.php

* Update common.php

* Update common.php

* Update auth.php

* Update components.php

* Add files via upload

* Update errors.php

* Update entities.php

* Update entities.php

* Update entities.php

* Update auth.php

* Update activities.php

* Update components.php

* Update components.php

* Update entities.php

* Update components.php

* Update entities.php

* Update errors.php

* Update settings.php

* Update settings.php

* Add files via upload

* Update errors.php