fix(i18n): „Explore" statt „Discover" im englischen Text

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

web/index.html

@@ -4,7 +4,7 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>AirCard-IOS – Card designs for Apple Wallet</title>
-    <meta name="description" content="Discover community card designs for AirCard-iOS, create your own and download it as PNG." />
+    <meta name="description" content="Explore community card designs for AirCard-iOS, create your own and download it as PNG." />
     <meta name="theme-color" content="#0F1828" />
     <meta name="apple-mobile-web-app-title" content="AirCard-IOS" />
     <link rel="icon" href="/favicon.svg?v=2" type="image/svg+xml" />