wm_remove is an xcart custom smarty modifier. Look in your /include/templater/plugins folder - it is for webmaster mode hence the "wm"
Code:
#
# $Id: modifier.wm_remove.php,v 1.1.2.1 2009/04/02 06:51:20 ferz Exp $
#
# Templater plugin
# -------------------------------------------------------------
# Type: modifier
# Name: wm_remove
# Purpose: remove Webmaster mode environment
# -------------------------------------------------------------
#
Quote:
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2. $lng.txt_site_title = X-CART. Powerful PHP shopping cart software
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The language variable for site title usage began some incremental releases ago.