Например так:
Nop.Web/Views/Catalog/CategoryTemplate.ProductsInGridOrLines.cshtml
line 47
@if(!String.IsNullOrEmpty(Model.Description))
{
@*description*@
<div class="category-description">
@Html.Raw(Model.Description)
</div>
<div class="clear"></div>
}
Nop.Web/Views/Catalog/ManufacturerTemplate.ProductsInGridOrLines.cshtml
line 28
@if (!String.IsNullOrEmpty(Model.Description))
{
@*description*@
<div class="manufacturer-description">
@Html.Raw(Model.Description)
</div>
<div class="clear"></div>
}