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
Remove languages (suggested by @sorah)
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)
Translate 02-2014 news posts (es)
Merge pull request #765 from dabit/master

Translate 02-2014 news posts (es) 

Looks cool @dabit, thanks :)
Translate the 05-2014 news posts (es)
Merge pull request #767 from dabit/2014-05

Translate the 05-2014 news posts (es)