Modifying SOAP Envelope using XSLT

I am fairly new with XSLT and wondering how to change the XML SOAP message to add more tags in between

Source XML:

<soapenv:Envelope xmlns:soapenv="http://ift.tt/sVJIaE" xmlns:soapenc="http://ift.tt/wEYywg" xmlns:xsd="http://ift.tt/tphNwY" xmlns:xsi="http://ift.tt/ra1lAU">
   <soapenv:Body>
      <DataValidationFailureFault xmlns="http://sample.com">
         <ValidationErrorList>
            <ValidationError>
               <ErrorCode>1234</ErrorCode>
               <ErrorString>Test Error</ErrorString>
            </ValidationError>
         </ValidationErrorList>
      </DataValidationFailureFault>
   </soapenv:Body>
</soapenv:Envelope>

After XSLT, I want the XML SOAP to look like:

<soapenv:Envelope xmlns:soapenv="http://ift.tt/sVJIaE" xmlns:soapenc="http://ift.tt/wEYywg" xmlns:xsd="http://ift.tt/tphNwY" xmlns:xsi="http://ift.tt/ra1lAU">
   <soapenv:Body>
      <soapenv:Fault>
         <faultcode>HardCoded Value</faultcode>
         <faultstring>HardCoded Value</faultstring>
         <detail>
            <DataValidationFailureFault xmlns="http://sample.com">
               <ValidationErrorList>
                  <ValidationError>
                    <ErrorCode>1234</ErrorCode>
                    <ErrorString>Test Error</ErrorString>
                  </ValidationError>
               </ValidationErrorList>
            </DataValidationFailureFault>
         </detail>
      </soapenv:Fault>
   </soapenv:Body>
</soapenv:Envelope>