message: Add possibility to import custom styles by extending the theme
diff: </script>
  </body>
  ]]>
  +</value>
  + </replacement>
  + <replacement>
  + <token><![CDATA[</head>]]></token>
  + <value xml:space="preserve">
  +<![CDATA[
  + <#if properties.styles?has_content>
  + <#list properties.styles?split(' ') as style>
  + <link href="${resourceUrl}/${style}" rel="stylesheet"/>
  + </#list>
  + </#if>
  + </head>
  +]]>
  </value>
  </replacement>
  </replacements>
  