title: Operations inside Rails I18n locales' strings
body: <p>I am trying to put operations inside the locales to adapt to different languages. For example, in English a billion is 1,000,000,000,  however in Spanish a billion is 1,000,000,000,000 so I would like to be able to have the following:</p>
  
  <pre><code>en:
    billion: "You have %{money} billions"
  es:
    billion: "Tienes %{money/1000.0} billones"
  </code></pre>
  
  <p>In order to be able to write:</p>
  
  <pre><code>I18n.t :billion, :money =&gt; whatever
  </code></pre>
  
  <p>And be right for whatever language.</p>
  
  <p>However, it seems that I cannot put operations inside the locales' strings. </p>
  
  <p>Any hint on how should I be doing this? Maybe my approach is just wrong "philosophically" talking? </p>
  
  <p>Thanks all!</p>