title: Use scope in distance_of_time_in_words_to_now to use default language [EN]
body: <p>My Rails Application uses internationalization.</p>
  
  <p>In my admin stats I want to display the last log in time of users:
  <code>
  &lt;td&gt; &lt;%= distance_of_time_in_words_to_now(user.current_sign_in_at) %&gt; ago &lt;/td&gt;
  </code></p>
  
  <p>But rails wants to translate the whole statement and I get the following translation error:
  <code>
  translation missing: de.datetime.distance_in_words.x_days ago
  </code></p>
  
  <p>How can I tell rails to use the default [EN] language in <code>distance_of_time_in_words_to_now</code> ?</p>