Category Description More Link - missing Less

[ukbaz]

In Prestashop 1.6 category descriptions there is a 'More' link that expands description - however theer is no 'Less ' link to close it again.

Code is used twice as:

                        {if $category->description}
                            <div class="cat_desc rte">
                            {if Tools::strlen($category->description) > 350}
                                <div id="category_description_short">{$description_short}</div>
                                <div id="category_description_full" class="unvisible">{$category->description}</div>
                                <a href="{$link->getCategoryLink($category->id_category, $category->link_rewrite)|escape:'html':'UTF-8'}" class="lnk_more">{l s='More'}</a>
                            {else}
                                <div>{$category->description}</div>
                            {/if}
                            </div>
                        {/if}
                    </div>

Where /how do I insert a 'less' link?

Thanks