materio-base-d7/sites/all/modules/contrib/admin/context/theme/context-block-browser.tpl.php

<div class='context-block-browser clearfix'>
  <div class="blocks">
    <?php foreach ($blocks as $module => $module_blocks): ?>

    <?php if (!empty($module_blocks)): ?>
    <div class='category category-<?php print $module ?> clearfix'>
      <div class="category-label"><?php print $module; ?></div>
      <?php foreach ($module_blocks as $block): ?>
        <?php print theme('context_block_browser_item', array('block' => $block)); ?>
      <?php endforeach; ?>
    </div>
    <?php endif; ?>

    <?php endforeach; ?>
  </div>
  <div class="block-browser-sidebar">
    <div class='categories'><?php print render($categories); ?></div>
    <div class='filter'><?php print render($filter_label); ?></div>
    <?php print render($help_text); ?>
  </div>
</div>