title: Activeadmin query for every attribute label on database
body: <p>Using <code>i18n-active_record</code> for mult locales. It works fine on my site.</p>
  
  <p>But the issue I am facing is that in <code>activeadmin</code> page take too much time to load and when I see logs it query on translation table for every label </p>
  
  <p>e.g</p>
  
  <pre><code>SELECT COUNT(*) FROM `translations` WHERE `translations`.`locale` = 'en' AND (`key` IN ('activerecord.models.admin') OR `key` LIKE 'activerecord.models.admin.%');
  
  SELECT COUNT(*) FROM `translations` WHERE `translations`.`locale` = 'en' AND (`key` IN ('active_admin.resources.article.new_model') OR `key` LIKE 'active_admin.resources.article.new_model.%');
  
  SELECT COUNT(*) FROM `translations` WHERE `translations`.`locale` = 'en' AND (`key` IN ('formtastic.labels.q.index.title') OR `key` LIKE 'formtastic.labels.q.index.title.%'); 
  
  SELECT COUNT(*) FROM `translations` WHERE `translations`.`locale` = 'en' AND (`key` IN ('formtastic.labels.q.title') OR `key` LIKE 'formtastic.labels.q.title.%'); 
  </code></pre>
  
  <p>Due to this there is lot load on database as admin panel usage is more and for every column there are 200+ queries on translation table </p>
  
  <p>How to load activeadmin without locales?</p>