Hacking Homebrew Wii U content folder names

[Gabryx86_64]

I need to know some language folder names for a thing I'm doing, for now i only know the European region ones that i got through FTPiiU plus an American region one:

Europe:

• EuDutch
• EuEnglish
• EuFrench
• EuGerman
• EuItalian
• EuPortuguese
• EuRussian
• EuSpanish

American:

• UsEnglish
• ???

Japan:

• ???

If anyone with an American or a Japanese Wii U could tell me the various languages for their region I would really be grateful.