XLST 1.0 Group elements in output after changing values

Basically im a xlst newbie and have been tasked with working on some changes to a large xls file that handles the transformation of movies metadata for the german market.

The xls file looks something like this:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:str="http://ift.tt/rkTpc5" xmlns:xsl="http://ift.tt/tCZ8VR" version="1.0" xmlns:redirect="http://ift.tt/1zFVdmc" extension-element-prefixes="redirect" xmlns:xalan="http://ift.tt/w7zGWI" exclude-result-prefixes="xalan str">
<xsl:output method="xml" indent="yes" xalan:indent-amount="4"/>
<xsl:strip-space elements="*"/>
<xsl:template match="/metadata">
    <xsl:variable name="featureID" select="substring(mpm_product_id, 7, string-length(mpm_product_id))"/>
    <xsl:variable name="smallcase" select="'abcdefghijklmnopqrstuvwxyz'" />
    <xsl:variable name="uppercase" select="'ABCDEFGHIJKLMNOPQRSTUVWXYZ'" />
    <Metadata>

    <some values...>

    <xsl:for-each select="genres/genre">

                    <Genre>
                            <xsl:choose>

                              <!-- Mappings for German Genres -->
                                <xsl:when test="/metadata/base/territory_code='DE'">
                                    <xsl:choose>

                                        <xsl:when test=".= 'Action'">Action und Abenteuer</xsl:when>
                                        <xsl:when test=".= 'Adventure'">Action und Abenteuer</xsl:when>
                                        <xsl:when test=".= 'Animation'">Zeichentrick</xsl:when>
                                        <xsl:when test=".= 'Anime'">Zeichentrick</xsl:when>
                                        <xsl:when test=".= 'Bollywood'">Bollywood</xsl:when>
                                        <xsl:when test=".= 'Classics'">Drama > Klassiker</xsl:when>
                                        <xsl:when test=".= 'Comedy'">Komödie</xsl:when>
                                        <xsl:when test=".= 'Concert Film'">Musik</xsl:when>
                                        <xsl:when test=".= 'Crime'">Kriminalfilm > Drama</xsl:when>
                                        <xsl:when test=".= 'Drama'">Drama</xsl:when>
                                        <xsl:when test=".= 'Fantasy'">Drama > Sci-Fi und Fantasy</xsl:when>
                                        <xsl:when test=".= 'Foreign'">International</xsl:when>
                                        <xsl:when test=".= 'Horror'">Kriminalfilm > Horror</xsl:when>
                                        <xsl:when test=".= 'Independent'">Independentfilm &amp; Arthouse</xsl:when>
                                        <xsl:when test=".= 'Japanese Cinema'">International > Japan</xsl:when>
                                        <xsl:when test=".= 'Jidaigeki'">International > Japan</xsl:when>
                                        <xsl:when test=".= 'Kids &amp; Family'">Kinderfilm > Familie</xsl:when>
                                        <xsl:when test=".= 'Music Documentary'">Musik > Dokumentation</xsl:when>
                                        <xsl:when test=".= 'Music Feature Film'">Musik</xsl:when>
                                        <xsl:when test=".= 'Musicals'">Musik > Musical</xsl:when>
                                        <xsl:when test=".= 'Mystery'">Drama > Mystery</xsl:when>
                                        <xsl:when test=".= 'Nonfiction - Documentary'">Dokumentation</xsl:when>
                                        <xsl:when test=".= 'Regional Indian'">International > Indien &amp; Pakistan</xsl:when>
                                        <xsl:when test=".= 'Romance'">Drama > Romanze</xsl:when>
                                        <xsl:when test=".= 'Science Fiction'">Science Fiction und Fantasy</xsl:when>
                                        <xsl:when test=".= 'Short Films'">Independentfilm &amp; Arthouse > Experimentalfilm</xsl:when>
                                        <xsl:when test=".= 'Special Interest'">Hobby</xsl:when>
                                        <xsl:when test=".= 'Sports'">Sport</xsl:when>
                                        <xsl:when test=".= 'Thrillers'">Thriller</xsl:when>
                                        <xsl:when test=".= 'Tokusatsu'">International > Japan</xsl:when>
                                        <xsl:when test=".= 'Urban'">Drama > Alltag</xsl:when>
                                        <xsl:when test=".= 'Westerns'">Western</xsl:when>

                                        <xsl:otherwise>
                                            <xsl:value-of select="." />
                                        </xsl:otherwise>
                                     </xsl:choose>
                                </xsl:when>


                            </xsl:choose> 

                    </Genre>
                </xsl:for-each>
       <More values...>
    </Metadata>
</xsl:template>

Issue being when the genres are transformed we end with duplicate values for example when the input contains the elements

<genres>
    <genre>Comedy</genre>
    <genre>Adventure</genre>
    <genre>Action</genre>
</genres>

After transformation we have

<Genre>Komödie</Genre>
<Genre>Action und Abenteuer</Genre>
<Genre>Action und Abenteuer</Genre>

I have tried looking for some solution for this but i have not reached the solution and any help would be appreciated.