title: regenerate prestashop category tree
body: <p>I imported prestashop categories in 2500 from a CSV file. I respected the ties of parentage, everything works in the navigation or in the backoffice.</p>
  
  <p>However, the category tree (which can be seen when we created a new product or you want to put a scene in a category) is not "update". I see all my categories ... in bulk.</p>
  
  <p>How can regenerate this tree?</p>