Fixed some php notices in simplepie.inc.php

tbrehm

2013-09-26 73de7a9591f0b471c12736eb5ef02224e039bd46

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<?php
$wb['description_txt'] = 'Description';
$wb['name_txt'] = 'Group';
$wb['name_err'] = 'Group must be min 1, max 30 Chars.';
?>