Hallo,
versuch es mal in /themes/Frontend/DEIN_THEME/frontend/index/index.tpl
{extends file='parent:frontend/index/index.tpl'}
{block name='frontend_detail_data_ordernumber'}
{$smarty.block.parent}
{* Product Weight *}
{if $sArticle.weight}
{* Product weight - Label *}
{s name="DetailDataWeight" namespace="frontend/detail/index"}Versandgewicht:{/s}
{* Product Weight - Content *}
{$sArticle.weight|currency:no_symbol} kg
{/if}
{/block}
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