gistfile1.rb

require 'rubygems'
require 'dm-core'

DataMapper.setup(:default, 'sqlite3::memory:')

class Article

  include DataMapper::Resource

  property    :id,      Serial
  property    :title,   String
  property    :body,    Text
  property    :locale,  String

  belongs_to  :link

end

class Link

  include DataMapper::Resource

  property  :id,        Serial
  has n,    :articles
  # or a number of languages, if it`s fixed

end

DataMapper.auto_migrate!

article_en = Article.new(
:title => "ENGLISH article", :body => "english", :locale => 'en-EN' )
article_ru = Article.new(
:title => "RUSSIAN article", :body => "russian", :locale => 'ru-RU' )

link1 = Link.new
link1.articles << article_en << article_ru
link1.save

article_en = Article.new(
:title => "ENGLISH article #2", :body => "english #2", :locale => 'en-EN' )
article_ru = Article.new(
:title => "RUSSIAN article #2", :body => "russian #2", :locale => 'ru-RU' )

link2 = Link.new
link2.articles << article_en << article_ru
link2.save

puts link1.articles.first(:locale => 'ru-RU').inspect
puts link2.articles.first(:locale => 'ru-RU').inspect