<?php
function bootstrap_subtheme_adl_admin_button($variables) {
  $element = $variables['element'];
  $value = $element['#value'];
   if (!empty($element['#icon'])) {
     if ($element['#icon_position'] === 'before') {
       $value = $element['#icon'] . ' ' . $value;
     }
   elseif ($element['#icon_position'] === 'after') {
     $value .= ' ' . $element['#icon'];
    }
  }

return '<input' . drupal_attributes($element['#attributes']) . '>n';
}