I don't think it's in Japanese, I thought it was Hylian, actually. I first noticed it when I was listening to KK songs on YouTube, and it had the album cover on it; it didn't look like Japanese at all, and the letters for each cover weren't even consistent. I'm guessing they did that because it has to be translated into so many languages.
The first picture really looks like Japanese, I'm not really sure why they left that there. I noticed it in Mac's house earlier.
Oh that's good to know. I can't read Japanese and don't know what any of the letters look like so I too assumed it was untranslated Japanese. Thank you for clarifying that!!