title: Warning log for sprintf function in widget.php
body: <p>every time my wordpress theme load my host add 50 line in error_log file like this:</p>
  
  <pre><code>[22-Sep-2017 13:00:01 UTC] PHP Warning:  sprintf(): Too few arguments in ..../wp-includes/widgets.php on line 672
  </code></pre>
  
  <p>Wordpress v4.8.2</p>