settings
title — Form title displayed above the progress bar.
subtitle — Small text below the title (e.g. "We reply within 24h").
lang — Validation error language: en, fr, es, pt, it, de.
width — Form width in px (QuietForm only). Default: 480.
endpoint — Submission URL. Required for live forms.
provider — Form provider key (see Providers section).
providerFormId — Provider-specific access key (Web3Forms only).