Merge pull request #385 from koyhoge/1.7/develop_japanese

Translate classes/asset/usage.html
packages/auth/simpleauth/intro.html の一部を翻訳
Update security.html
Merge pull request #387 from sharkpp/1.7/develop_japanese

packages/auth/simpleauth/intro.html の一部を翻訳
Merge pull request #388 from ounziw/1.7/develop_japanese

Update security.html
Translate updated part of class/arr.html.