feat(web-i18n): add es/fr locales and expand switcher locale set

apps/web/src/messages/de.json

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+{
+  "Home": {
+    "badge": "Web-App",
+    "title": "Dein Next.js CMS Frontend",
+    "description": "Diese Seite liest Beiträge über das gemeinsame Datenbank-Paket.",
+    "latestPosts": "Neueste Beiträge",
+    "explore": "Entdecken",
+    "noExcerpt": "Kein Auszug"
+  },
+  "LanguageSwitcher": {
+    "label": "Sprache",
+    "localeNames": {
+      "de": "Deutsch",
+      "en": "Englisch",
+      "es": "Spanisch",
+      "fr": "Französisch"
+    }
+  }
+}

apps/web/src/messages/en.json

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+{
+  "Home": {
+    "badge": "Web App",
+    "title": "Your Next.js CMS Frontend",
+    "description": "This page reads posts through the shared database package.",
+    "latestPosts": "Latest posts",
+    "explore": "Explore",
+    "noExcerpt": "No excerpt"
+  },
+  "LanguageSwitcher": {
+    "label": "Language",
+    "localeNames": {
+      "de": "German",
+      "en": "English",
+      "es": "Spanish",
+      "fr": "French"
+    }
+  }
+}

apps/web/src/messages/es.json

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+{
+  "Home": {
+    "badge": "Aplicación Web",
+    "title": "Tu Frontend CMS con Next.js",
+    "description": "Esta página lee publicaciones a través del paquete compartido de base de datos.",
+    "latestPosts": "Últimas publicaciones",
+    "explore": "Explorar",
+    "noExcerpt": "Sin extracto"
+  },
+  "LanguageSwitcher": {
+    "label": "Idioma",
+    "localeNames": {
+      "de": "Alemán",
+      "en": "Inglés",
+      "es": "Español",
+      "fr": "Francés"
+    }
+  }
+}

apps/web/src/messages/fr.json

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+{
+  "Home": {
+    "badge": "Application Web",
+    "title": "Votre Frontend CMS Next.js",
+    "description": "Cette page lit les publications via le package base de données partagé.",
+    "latestPosts": "Dernières publications",
+    "explore": "Explorer",
+    "noExcerpt": "Aucun extrait"
+  },
+  "LanguageSwitcher": {
+    "label": "Langue",
+    "localeNames": {
+      "de": "Allemand",
+      "en": "Anglais",
+      "es": "Espagnol",
+      "fr": "Français"
+    }
+  }
+}