Add Korean translation

[Johnmacrocraft]

• This PR actually submits something - don't use this system as a messaging service!
• This PR isn't duplicated - you can check if it is by scanning the small list - link is on the navigation bar for this repository.
• This PR includes appropriate markdown for sections - e.g. code blocks for suggested code.
• This PR description and comments in code is understandable - feel free to use your native language to write if you are not comfortable with English.
• This PR has a single branch for itself in your fork - don't just commit to the master branch of your repository!
• This PR has comments written in clear English - please don't write unreadable comments just for your eyes.

Pull Request description

Just a translation submission from a (bored) translator, enjoy! :)

(Ignore branch name, I couldn't translate into Japanese because of laziness, and forgot to rename it. Probably I'll do it later if I have time)

[Johnmacrocraft]

It would be appreciated if you make strings for enabled and disabled, instead of hardcoding them in the code, this makes translations weird for (I guess?) most languages

[Johnmacrocraft]

@Aericio The pvp.success one.

• Q1: auto.*
• Q2: setowner.desc
• Q3: popup.available

[Johnmacrocraft]

Some issues:

• Padding won't work properly because of Unicode characters, you'll probably want to fix that if possible
• /p list doesn't seem to work properly (on most languages)
• langtemplate can be selected as a language (I don't think someone will do that, but anyway this is not intended)

[Johnmacrocraft]

Question:

• I'm assuming that the word free in auto strings means something like empty, rather than $0, is that right?
• By without charging anything, does it mean that players can set owner without paying money? Just in case.
• Not sure which meaning is better for the word open, I definitely understood the string but still thinking of which one would be the best word to use. What's the exact meaning of that?

[Aericio]

It would be appreciated if you make strings for enabled and disabled, instead of hardcoding them in the code, this makes translations weird for (I guess?) most languages

for when server starts/enables, the messages for them?

also, for the questions, can you show where you mean please? thanks.

[jasonw4331]

The /p list fix should not be included in this PR.

[Johnmacrocraft]

As I reverted my changes to other language files and the questions from the above have been resolved, you can merge this now.

[Aericio]

lmao that wasn't a month late