I believe type="vanished" means the text "upstream" that was originally requiring translation no longer exists. So I think it happens when, for example, someone rewrites a string, maybe to make the English easier to understand. That means the tool that generates the translations can no longer find the original value - so it's "vanished". In the case you were making an update, you'd find a new, untranslated string had appeared.

Again, as I understand it, type="unfinished" means there's no translation - so the string needs translating for the language support to be complete.

Thanks :)
As soon as possible, let me PR it(Creating Korean translation_ko_KR.ts or Updating Korean translation_ko_KR.ts).

The translation process will probably start very soon. There's still a little bit to change translation wise but after that you should be good to go.

Just now, I have done all the translation for Korean.
I hope it to be merged this version first.

Don't worry, we know each other well.