Du musst einfach den Wer 50 verändern in der box-basic.tpl veränern:
{* Product name *}
{block name=‘frontend_listing_box_article_name’}
class=“product–title”
title="{$sArticle.articleName|escapeHtml}">
{$sArticle.articleName|truncate: 50 |escapeHtml}
{/block}