Also update catalog\includes\languages\english\modules\content\product_info\cm_pi_extended_reviews.php
define('REVIEWS_TEXT_RATED_LETKNOW','Let other customers know about this product.');
Also update catalog\includes\languages\german\modules\content\product_info\cm_pi_extended_reviews.php
define('REVIEWS_TEXT_RATED_LETKNOW','Teilen sie Ihre Erfahrungen über dieses Produkt mit anderen!');