Fixed PHP warning when no IDN filters are set for field in lists.

Till Brehm

2015-11-14 cc636e1a8ed430f060766e22cbdfeaa8de4afbc3

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<?php
$wb['head_txt'] = 'Install software package';
$wb['install_key_txt'] = 'Enter install key';
$wb['btn_save_txt'] = 'Start Installation';
$wb['btn_cancel_txt'] = 'Cancel';
?>