[Gelöst] A form field does not translate for me

Background of the issue:
I am using the WPML plugin to translate form fields on my website versteckter Link. Most fields have been successfully translated.

Symptoms:
The NIE/DNI field does not complete the translation and is not shown in the Spanish version of the form.

Questions:
Why is the NIE/DNI field not translating to Spanish using WPML?