feat: more currencies, auto-detection, globe-only language toggle

- 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

api/rates.php

@@ -15,7 +15,9 @@ if (file_exists($cacheFile)) {
     }
 }
 
-$url = 'https://api.coingecko.com/api/v3/simple/price?ids=monero&vs_currencies=eur,usd,chf';
+$currencies = $_GET['c'] ?? 'eur,usd,chf,gbp,jpy,rub,brl';
+$currencies = preg_replace('/[^a-z,]/', '', strtolower($currencies));
+$url = 'https://api.coingecko.com/api/v3/simple/price?ids=monero&vs_currencies=' . $currencies;
 $ch = curl_init($url);
 curl_setopt_array($ch, [
     CURLOPT_RETURNTRANSFER => true,

app.js

@@ -2,7 +2,7 @@
   'use strict';
 
   // --- Config ---
-  const COINGECKO_API = '/api/rates.php';
+  const COINGECKO_API = '/api/rates.php?c=eur,usd,chf,gbp,jpy,rub,brl';
   // Standard address (4..., 95 chars), Subaddress (8..., 95 chars), Integrated address (4..., 106 chars)
   const XMR_STANDARD_REGEX = /^[48][1-9A-HJ-NP-Za-km-z]{94}$/;
   const XMR_INTEGRATED_REGEX = /^4[1-9A-HJ-NP-Za-km-z]{105}$/;
@@ -13,6 +13,7 @@
   let fiatRates = null;
   let ratesTimestamp = 0;
   let countdownInterval = null;
+  let countdownTick = null;
   let ratesFailed = false;
   let invoiceCode = null; // short URL code for this invoice
 
@@ -53,7 +54,35 @@
   let pdfLoaded = false;
   let lastPaidData = null;
 
+  // --- Currency Detection ---
+  function detectCurrency() {
+    var localeToCurrency = {
+      'de': 'EUR', 'fr': 'EUR', 'it': 'EUR', 'es': 'EUR', 'pt': 'EUR', 'nl': 'EUR',
+      'de-CH': 'CHF', 'fr-CH': 'CHF', 'it-CH': 'CHF',
+      'de-AT': 'EUR',
+      'en-GB': 'GBP',
+      'en-US': 'USD', 'en': 'USD',
+      'ja': 'JPY',
+      'ru': 'RUB',
+      'pt-BR': 'BRL'
+    };
+    var langs = navigator.languages || [navigator.language || 'en'];
+    for (var i = 0; i < langs.length; i++) {
+      var tag = langs[i];
+      if (localeToCurrency[tag]) {
+        currencySelect.value = localeToCurrency[tag];
+        return;
+      }
+      var short = tag.substring(0, 2).toLowerCase();
+      if (localeToCurrency[short]) {
+        currencySelect.value = localeToCurrency[short];
+        return;
+      }
+    }
+  }
+
   // --- Init ---
+  detectCurrency();
   fetchRates();
   loadFromHash() || loadSaved();
   registerSW();
@@ -77,6 +106,8 @@
       buildSummary(xmrAmount, desc, selectedDays);
       updatePageTitle(xmrAmount, desc);
     }
+    // Countdown text
+    if (countdownTick) countdownTick();
   });
 
   // --- Events ---
@@ -410,6 +441,7 @@
       }
     }
 
+    countdownTick = tick;
     tick();
     countdownInterval = setInterval(tick, 60000); // Update every minute, not every second
   }

i18n.js

@@ -376,10 +376,6 @@ var I18n = (function () {
 
     applyDOM(t);
 
-    // Update toggle label
-    var cur = document.getElementById('langCurrent');
-    if (cur) cur.textContent = languages[lang].name;
-
     // Update dropdown active state
     document.querySelectorAll('.lang-option').forEach(function (btn) {
       btn.classList.toggle('active', btn.getAttribute('data-lang') === lang);

index.html

@@ -29,9 +29,13 @@
           <input type="number" id="amount" placeholder="0.00" min="0" step="any">
           <select id="currency" data-i18n-aria="aria_currency" aria-label="Currency">
             <option value="XMR">XMR</option>
-            <option value="EUR" selected>EUR</option>
+            <option value="EUR">EUR</option>
-            <option value="USD">USD</option>
+            <option value="USD" selected>USD</option>
             <option value="CHF">CHF</option>
+            <option value="GBP">GBP</option>
+            <option value="JPY">JPY</option>
+            <option value="RUB">RUB</option>
+            <option value="BRL">BRL</option>
           </select>
         </div>
         <div class="fiat-hint" id="fiatHint"></div>
@@ -112,7 +116,6 @@
         <path d="M2 12h20"/>
         <path d="M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10A15.3 15.3 0 0 1 12 2z"/>
       </svg>
-      <span id="langCurrent">English</span>
     </button>
     <div class="lang-dropdown" id="langDropdown"></div>
   </div>