Translate Korean and Japanese MyStuff stuff

[sjkim04]

..including

• Korean
  • character names
  • kart names
  • missions
• Japanese
  • missions

[CyberYoshi64]

Bumping this pull request as it appears to have been slipped past.

Please fix the mission title for 2-3 Japanese, as it was left as "Mission title".

A minor problem with 1-4, 2-1 and 4-4 Japanese, where the title is 2 characters too long to fit in the bottom screen button, but I don't think it's worth trying to adjust for that.

Otherwise, the text looks fine

[CyberYoshi64]

@sjkim04 Here goes yet another bump.

[PabloMK7]

I need to sign the mission files if I want to make changes, so I cannot commit directly. I will merge the changes manually. Thanks!