The theme developer provided me the solution to add the following code in catalog/product.tpl :
<div class="pro-manufacture">
<a href="{$link->getManufacturerLink($product.id_manufacturer)|escape:'html':'UTF-8'}" title="{Manufacturer::getNameById($product.id_manufacturer|escape:'html':'UTF-8')}">{Manufacturer::getNameById($product.id_manufacturer|escape:'html':'UTF-8')}</a>
</div>
Topic SOLVED. Thank you 