Translation of Frontend Form Labels?

I’m just building a multilanguage seite with a small Contact Form on every page. I’m just wondering how to translate the labels and placeholders for the form-configuration in the page header. Is it possible to use the themes language.yml here, or do I need to create a form for each language with static labels?

Add your strings into the user/languages folder, like explained in and use those strings into your form definition. For example


  LABEL1: "Something"

form definition:

   label: MY_FORM.LABEL1