html error retourned to contact create epp request

[vohmar]

in case contact create has ident type birthday with invalid date format ie 01-01-2000 HTML error is returned instead of xml stating invalid date format

replicated on registry master branch on test and staging

sample request:

Sillius Soddus

    </contact:postalInfo>
    <contact:voice>+372.1234567</contact:voice>
    <contact:email>[email protected]</contact:email>
  </contact:create>
</create>
<extension>
  <eis:extdata xmlns:eis="https://epp.tld.ee/schema/eis-1.0.xsd">
    <eis:ident type="birthday" cc="LV">31-12-2000</eis:ident>
  </eis:extdata>
</extension>
<clTRID>Märi Änn R2-1622011768</clTRID>

may be related to #1952