The Contact Form is working perfectly when being used in only the English language.
However, as soon as I try to use a different language, the field titles disappear. Like this.
The .mo and .po files are in the languages folder so the translations should be available.
I activate the form by pasting the shortcode (e.g. [contact_form lang=de]) in the relevant page.
Can someone please tell me what I am doing wrong.