[Docs] add japanese translations (#7454) ...template from the qmk_firmware githubpage ...18669334+noroadsleft@users.noreply.github.com> ...Request from PR #7455 made by github user noroadsleft ...ISHII <2170248+mtei@users.noreply.github.com> ...By: shela <shelaf@users.noreply.github.com>