fix(translation): exclude value of @cert from transformation

scenarios/xslt/edxml2html/libs/html-philology.lib.xsl

@@ -129,7 +129,7 @@
                     <xsl:value-of select="./@cert"/>
                 </xsl:attribute>
             </xsl:if>
-            <xsl:apply-templates select="@* | node()"/>
+            <xsl:apply-templates select="@*[name()!='cert'] | node()"/>
         </xsl:element>
     </xsl:template>