[Typo3] mailformplus error-handling

[Jan Wulff]

Hi Thomas,

the ###ERROR### marker (or the ###ERROR_name### markers for specific error
messages) must been set in the ###TEMPLATE_FORM### template. For example:

<!-- ###TEMPLATE_FORM### begin -->
###ERROR###
Formdata & Fields
<!-- ###TEMPLATE_FORM### end -->

<!-- ###TEMPLATE_ERROR### begin -->

<!-- ###ERROR_START### begin -->
<div class="error">
<!-- ###ERROR_START### end -->

<!-- ###ERROR_END### begin -->
</div>
<!-- ###ERROR_END### end -->

<!-- ###TEMPLATE_ERROR### end -->

Regards
Jan