title: country_code list for geocoder gem
body: <p>I'm using <a href="https://github.com/alexreisner/geocoder" rel="nofollow">geocoder</a> to detect country user.</p>
  
  <p>On my app I need detect country user. I make something like:</p>
  
  <pre><code>c = request.location.country_code
    case c
      when 'US'
       I18n.locale = :en
      when 'ES'
       I18n.locale = :es
      else
       locale ||= I18n.default_locale
     end
  </code></pre>
  
  <p><strong>My question is where can I find a <code>country_code</code> list for my other languages?</strong></p>