Fix unnatural wording.
Merge pull request #407 from koyhoge/1.7/develop_japanese

Fix unnatural wording.
目次の翻訳（途中）
Merge pull request #408 from kenjis/toc

目次の翻訳（途中）
Merge pull request #409 from sharkpp/1.7/develop_japanese

packages/auth/simpleauth/usage.html を翻訳中
Update classes/fuel.html
Unification of terms
Update classes/config.html
目次の翻訳（途中）
Merge pull request #410 from shinagaki/fix_fuel

Unification of terms
Merge pull request #411 from kenjis/toc

目次の翻訳（途中）