Customization of a cross-reference to a qandaentry not working forme

Hello,

I have some problems trying to customize the generated text of an
cross-reference (xref) to a qandaentry. Following
http://www.sagehill.net/docbookxsl/CustomXrefs.html I've added this bit
of code to the one of the stylesheets I use:

<xsl:param name="local.l10n.xml" select="document('')"/>
<l:i18n xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0">
  <l:l10n language="de">
    <l:context name="xref">
      <l:template name="qandaentry" text="Frage&#160;%n"/>
    </l:context>
    <l:context name="xref-number">
      <l:template name="qandaentry" text="Frage&#160;%n"/>
    </l:context>
    <l:context name="xref-number-and-title">
      <l:template name="qandaentry" text="Frage&#160;%n"/>
    </l:context>
  </l:l10n>
</l:i18n>

The stylesheet, which contains this code, is imported by the final
custom stylesheet (via xsl:import), which first imports (also via
xsl:import) the current docbook-xsl stylesheets v1.70.1. But when I
process the document I still get the text created by the qanadanetry
template of de.xml of docbook-xsl: 'F:&#160;%n'. What am I doing wrong?

Thanks an advance.
Regards, Daniel