Translate the-2014-ruby-hero-awards into ja (ja)
Merge pull request #626 from makimoto/2014-ruby-hero-awards-ja

Translate the-2014-ruby-hero-awards into ja
Update TIOBE paragraph on about page (de)
Add Ruby Toolbox paragraph to libraries page (de)
Move "Other Implementations" to about page (de)

Move section from downloads page to about page,
slightly adapt its first paragraph to the new context,
introduce named link references.
Move installation steps to installation page (de)