[Maverynthia]

So Calibre has the BUG (Yes it's a BUG Mr. Goyal not a FEATURE) if you are in the EN version to convert Japanese titles to Chinese Pinyin which is unacceptable because the books state they are in language field they are Japanese and Chinese isn't Japanese, so why aren't they converted to romaji.

Now the solution that put forth by Mr. Goyal is to "Just put your Calibre into Japanese!" Well some of us have translated books that use the Japanese title or some of us WANT to use the Japanese titles OR some of us are learning Japanese and having the whole program in Japanese is well, silly as we don't understand it (yet). THIS IS NOT A SOLUTION AT ALL.

SOLUTION:
You want to go into the C:\Program Files\Calibre2\resources\localization or the (x86) if on 32bit Calibre under 64bit windows and extract the locales.zip. (Might want to make a backup) Keep the locales.zip open in the archiver and open the ja folder. In the extracted folder open your flavor of English (or other language), AU, CA, or GB and grab the message.do plop it into the ja folder in the archive.
(Theoretically you can just move it from the EN_** folder into the ja folder and rezip too...)
Set Calibre to "Japanese" and it should be in English, however converting all the titles to romaji and not pinyin.
You might need to do this at every update unfortunately as this BUG isn't going to get fixed and I don't know about setting custom locales to where you can make this permanent.

Note this doesn't auto censor book titles you don't want people to see ;3

Disclaimer: I take no responsibility if you accidentally delete all your books and cause the universe to implode while doing this. Also not responsible if this causes any other bugs to manifest.