ruby/www.ruby-lang.org — pull request #586 by bash0C7 (2014-01-14 18:06:30+00:00)
Title: Add ja/installation & Fix parent pages

- Add link `ja/downloads` to `ja/installation`
- and translate `Ways of installing Ruby` section
- Add link `ja/documentation` to `ja/instllation`
- Fix link `ja/documentation` to `ja/downloads`
- (Under translation) Translate `en/installtion/index.md` into `ja/installation/index.md`
- Probably I complete translation of this page by the end of this week.