tooltip not present on picto, already present in $link

and some case they are conflict

htdocs/product/class/product.class.php

@@ -3185,8 +3185,8 @@ class Product extends CommonObject
         }
 
 		if ($withpicto) {
-			if ($this->type == Product::TYPE_PRODUCT) $result.=($link.img_object($langs->trans("ShowProduct").' '.$this->label, 'product', 'class="classfortooltip"').$linkend.' ');
-			if ($this->type == Product::TYPE_SERVICE) $result.=($link.img_object($langs->trans("ShowService").' '.$this->label, 'service', 'class="classfortooltip"').$linkend.' ');
+			if ($this->type == Product::TYPE_PRODUCT) $result.=($link.img_object('', 'product', '').$linkend.' ');
+			if ($this->type == Product::TYPE_SERVICE) $result.=($link.img_object('', 'service', '').$linkend.' ');
 		}
 		$result.=$link.$newref.$linkend;
 		return $result;