Fixed a few php warnings in the log module which appeared when no log data ...

tbrehm

2008-11-13 b3c1caa65da9da7a15202d979c45f6cc6bf002ae

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<?php
$wb['list_head_txt'] = 'Software updates';
$wb['installed_txt'] = 'Action';
$wb['update_title_txt'] = 'Update';
$wb['version_txt'] = 'Version';
$wb['action_txt'] = 'Action';
?>