title: Rails i18n - how to get all translations for a key
body: <p>I have my translations organized in the normal fashion:</p>
  
  <pre><code>en:
    foo:
      bar: 'hello friend'
  es:
    foo:
      bar: 'hola amigo'
  </code></pre>
  
  <p>I need to return a hash of all translations for a given key, with the language as the key of the hash, like this:</p>
  
  <pre><code># translations for foo.bar
  {
    en: 'hello friend',
    es: 'hola amigo'
  }
  </code></pre>
  
  <p>How can I pull that from the i18n engine?</p>