sorry you do want to pick up character data in td not just elements so
<xsl:template match="xhtml:th|xhtml:td">
<xsl:text> </xsl:text><xsl:apply-templates select="*"/><xsl:text> </xsl:text>
</xsl:templates>
should be
<xsl:template match="xhtml:th|xhtml:td">
<xsl:text> </xsl:text><xsl:apply-templates/><xsl:text> </xsl:text>
</xsl:templates>
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