add Japanese translation for "High Performance Animations"

This is a work done by @1000ch, @nakajmg, @ginpei, @kubosho, @tomo-e, @tacamy, and @soto3 in April (yes... sorry guys.)

@agektmr, I've already checked the translation, hoping you don't have to check it.
Could you instead look at the PO file? They didn't have translation for title and description so I made up ones.