title: human_attribute_name and translation files in rails
body: <p>I am running a site w/ English and Spanish translation files, with the English as the default.</p>
  
  <p>Using translations such as:</p>
  
  <pre><code>en:
    tenants:
      about: "About" 
  </code></pre>
  
  <p>to </p>
  
  <pre><code>es:
    tenants:
      about: "Acera" 
  </code></pre>
  
  <p>Using </p>
  
  <pre><code>t "tenants.about"
  </code></pre>
  
  <p>Works without issue and reads properly from either the en.yml and es.yml files when appropriate.</p>
  
  <p>However, when trying to use the human_attribute_name property to pull model attributes from another section of the spanish es.yml file, the values are not being read.</p>
  
  <p>So something like</p>
  
  <pre><code>Job.human_attribute_name(:title)
  </code></pre>
  
  <p>Returns "title" instead of "Título".</p>
  
  <p>The portion of the same es.yml file with the humanized attributes is as follows:</p>
  
  <pre><code> es:
    tenants:
      about: "Acerca"
    activerecord:
      attributes:
        job:
          title: "Título de la oferta de trabajo"
          location: "Localización de la oferta de trabajo"
          job_type: "Tipo de trabajo"
          description: "Descripción"
  </code></pre>
  
  <p>Any insight would be appreciated.</p>