Can´t translate placeholders in comments input fields

Hello,

Little by little I have been able to translate almost everything by using loco translate and some googling. But I still can’t translate the placeholders appearing in the comments form.

Please find and screenshot attached.

You can replicate the issue using this URL: https://alfinlibre.net/como-distinguir-inversion-de-especulacion/

Could you help me with that?