Japanese Language File for ART 1.9.3

Hello @agriggio, if you put @yasuo on the mailing list with the new translations, he doesn’t have to check that page manually.

@yasuo, translators (like me) receive every now and then a mail with some new strings that need to be translated. Once the main translation is done, like you did, those little updates will cost you very little time.

I’m eager to see Art in Japanese!!