set bg-color to user-agent language's column

- add colgroup and thead
- languages map from /index.html
- set background-color to User-Agent language's column
Add redmine link issue to 1.9.3-p547 (zh_tw).
Merge pull request #757 from JuanitoFatas/doc/patch-1

Add redmine link issue to 1.9.3-p547 (zh_tw).
[ja][typo] Removed duplicated #
Remove languages (suggested by @sorah)
Small fix
Update Ruby 1.9.3-p547 post (de)
Latest news (ru)
Merge pull request #759 from gazay/last_news

Latest news (ru)
translate Ruby 1.9.3-p547 post (vi)
Merge pull request #762 from vinhnguyenleasnet/translate-2014-05-16-ruby-1-9-3-p547-released

translate Ruby 1.9.3-p547 post (vi)
Small fix (vi)
Merge pull request #742 from znz/set-bg-for-ua-lang

set bg-color to user-agent language's column
Translate latest news (pl)
translate ruby-1-9-3-p547-released (it)
Merge pull request #763 from alepore/ruby193p547_it

translate ruby-1-9-3-p547-released (it)
Fix typos (es)