title: Rails_admin, change datetime filters format
body: <p>Currently on rails_admin, when user wants to filter by datetime, it shows selected date in this format:</p>
  
  <p><a href="https://i.stack.imgur.com/6EbBl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/6EbBl.png" alt="img"></a></p>
  
  <p>However, it does not filter by date if its language is different than english.</p>
  
  <p>How to change format of datetime in filters?</p>