feat(i18n-ko): core — add ko to UiLocale model - #5011

Property 'unanswered' is missing in type '{ backgroundTerminal: string; empty: string; done: string; notDone: string; replacements: (n: number) => string; written: string; bytes: (n: number) => string; moreQuestions: (total: number) => string; }' but required in type 'QuietPreviewStrings'.