Handle translator

like in
https://www.tei-c.org/release/doc/tei-p5-doc/en/html/examples-monogr.html

Resolves #11
diff --git a/test/test-xml.sh b/test/test-xml.sh
index 659f9b9..f2a85ac 100755
--- a/test/test-xml.sh
+++ b/test/test-xml.sh
@@ -45,6 +45,15 @@
   ((ERRORS++))
 fi
 
+observed=$(xmlstarlet sel --net -t -v "/idsCorpus/idsDoc/idsText/idsHeader/fileDesc/sourceDesc/biblStruct/monogr/editor[@role='translator'][1]"  target/dnb13.i5.xml)
+if $(assert_eq "$observed" "Zwack, Heinz"); then
+  log_success "translator is correctly identified"
+else
+  log_failure "translator is not correctly identified: $observed"
+  ((ERRORS++))
+fi
+
+
 if [ $ERRORS -gt 0 ]; then
   log_failure "There were $ERRORS errors"
   exit 1
diff --git a/xslt/epub2i5.xsl b/xslt/epub2i5.xsl
index 28c8c2c..d6e0d68 100644
--- a/xslt/epub2i5.xsl
+++ b/xslt/epub2i5.xsl
@@ -24,6 +24,10 @@
 
     <xsl:variable name="autor"
         select="replace(string-join($dnbBookdata//dc:creator[not(contains(., '[')) or matches(., '\[Verfasser\]')], ' ; '), ' *\[[^\]]*\]', '')"/>
+        <xsl:variable name="straight_autor" select="normalize-space(replace(hlu:reversedAuthors($autor), ',', ''))"/>
+    <xsl:variable name="translator"
+        select="replace(string-join($dnbBookdata//dc:creator[matches(., '\[Übersetzer\]')], ' ; '), ' *\[[^\]]*\]', '')"/>
+        <xsl:variable name="straight_translator" select="normalize-space(replace(hlu:reversedAuthors($translator), ',', ''))"/>
 
     <xsl:variable name="straight_autor" select="normalize-space(replace(hlu:reversedAuthors($autor), ',', ''))"/>
 
@@ -282,7 +286,9 @@
                                     <h.title type="main"><xsl:value-of select="$titel"/></h.title>
                                     <h.title type="sub"><xsl:value-of select="$untertitel"/></h.title>
                                     <h.author><xsl:value-of select="$autor"/></h.author>
-                                    <editor/>
+                                    <xsl:if test="$translator">
+                                        <editor role="translator"><xsl:value-of select="$translator"/></editor>
+                                    </xsl:if>
                                     <edition>
                                         <further/>
                                         <kind>E-Book-Ausgabe</kind>