[TYPO3-mvc] translate placeholder for textarea

[Domi]

Hi,

I am struggling with the syntax of a placeholder which should be translated.

Following I tried:
<f:form.textarea class="tinymce" cols="50" rows="20" property="message" 
additionalAttributes="{required:'required', 
placeholder:'{f:translate(key=\'tx_intranet_domain_model_messages.message\')}'}"/>

Do I miss anything, or is it not possible having translated placeholders?

Regards,
Dominic