Fixed PHP warnings in install.lib.php

tbrehm

2008-12-07 aee6fd8a4abfef70736c5b7b80fe1236efc7d6a7

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<?php
$wb['list_head_txt'] = 'Export language files';
$wb['language_select_txt'] = 'Select language';
$wb['btn_save_txt'] = 'Export the selected language file set';
$wb['btn_cancel_txt'] = 'Back';
?>