Korean PDF export broken

When export pdf with korean, all korean character is replaced as #
This problem can be cleared by fixing 'xhtml2fo.xsl'
Inside of 'xhtml2fo.xsl', I think for korean,

<xsl:when test="starts-with($language, 'kp') or starts-with($language, 'kr')">FreeSerif, Baekmuk Gulim, AR PL UMing CN, serif</xsl:when>

but korean is starts-with 'ko' not 'kp'.

This cause the problem. After I fix all 'kp' to 'ko', this problem is fixed.