- Add GBP, JPY, RUB, BRL currencies
- Auto-detect currency from browser locale (de-CH→CHF, ru→RUB, etc.)
- USD as default fallback
- Language toggle: globe icon only (compact on mobile), full names in dropdown
- Countdown text updates on language switch
- CoinGecko proxy supports dynamic currency list
- Full translations for all UI strings in 7 languages
- Language picker shows native names (Français, Italiano, Español, Português, Русский)
- Auto-detection via navigator.languages
- Cyrillic font subset for Russian (Inter, 19KB)
- Footer shared across all languages (untranslated links)
- Tor onion: mc6wfeaqc7oijgdcudrr5zsotmwok3jzk3tu2uezzyjisn7nzzjjizyd.onion
- Onion link in footer and README
- PDF "BEZAHLT" block shows TX hash + date in second line
- Address placeholder 8... (encourages subaddress usage)
- All visible text pre-rendered in HTML (no empty→text shift)
- English as default language (i18n fallback + HTML inline text)
- German auto-detected via navigator.languages for DE browsers
- font-display: optional (no font-swap shift)
- Disabled button contrast fix (#a0a0a0 on #3a2215, 7.2:1)
- CoinGecko rates proxied via /api/rates.php with User-Agent
- Payment summary card with prominent amount display
- "Bezahlt" stamp over dimmed QR code with TX details below
- Hide wallet/address buttons when paid, show only PDF
- URI box removed (was technical noise)
- Smart countdown: "29 Tage, 23 Std." instead of ticking seconds
- Dynamic page title for shared invoices
- Font fallbacks with size-adjust to prevent layout shifts
- Async Google Fonts loading, proper preconnect hints
- Deferred script loading (defer attribute)
- Minified JS (app.min.js, i18n.min.js)
- WCAG contrast fixes for badges and disabled button
- Footer link always underlined for a11y
- Translated aria-labels via data-i18n-aria
- i18n onChange callback for dynamic content updates
- Result card fade-in animation, responsive QR on mobile
