title: Rails 3.1 translate model attribute name
body: <p>I'm trying to customize (translate) an active record attribute name in rails 3.1 ("first_name"). Here's beginning of my locale file (config/locales/sv.yml): </p>
  
  <pre><code>"sv":
    activerecord:
      models:
        employee: "Anställd"
      attributes:
        employee:
          first_name: "Förnamn"
  </code></pre>
  
  <p>I'm sure this file is used by rails because changing translations further down in the file works. 
  Here's the form field erb code that should say "Förnamn" not "First name": </p>
  
  <pre><code>  &lt;div class="field"&gt;
      &lt;%= f.label :first_name %&gt;&lt;br /&gt;
      &lt;%= f.text_field :first_name %&gt;
    &lt;/div&gt;
  </code></pre>
  
  <p>Running <code>Employee.human_attribute_name(:first_name)</code> in rails console returns "First name".
  Thank you very much</p>