chore(app): svelte-i18n + ui-messages-files (de/en)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/package.json

@@ -37,6 +37,7 @@
 		"highlight.js": "^11.11.1",
 		"marked": "^18.0.0",
 		"nostr-tools": "^2.23.3",
-		"rxjs": "^7.8.2"
+		"rxjs": "^7.8.2",
+		"svelte-i18n": "^4.0.1"
 	}
 }

app/src/lib/i18n/messages/de.json

@@ -0,0 +1,35 @@
+{
+  "nav": {
+    "home": "Home",
+    "archive": "Archiv",
+    "imprint": "Impressum",
+    "brand_aria": "Zur Startseite"
+  },
+  "home": {
+    "greeting": "Hi 🖖 Willkommen auf meinem Blog 🤗",
+    "latest": "Neueste Beiträge",
+    "more_archive": "Alle Beiträge im Archiv →",
+    "empty": "Keine Posts gefunden auf den abgefragten Relays."
+  },
+  "archive": {
+    "title": "Archiv",
+    "subtitle": "Alle Beiträge, nach Jahr gruppiert.",
+    "doc_title": "Archiv – Jörg Lohrer"
+  },
+  "post": {
+    "back_to_overview": "← Zurück zur Übersicht",
+    "untitled": "(ohne Titel)",
+    "published_on": "Veröffentlicht am {date}",
+    "also_available_in": "Auch verfügbar in:",
+    "not_found": "Post \"{slug}\" nicht gefunden.",
+    "unknown_error": "Unbekannter Fehler"
+  },
+  "imprint": {
+    "doc_title": "Impressum – Jörg Lohrer"
+  },
+  "lang": {
+    "de": "Deutsch",
+    "en": "English",
+    "switch_aria": "Sprache wechseln"
+  }
+}

app/src/lib/i18n/messages/en.json

@@ -0,0 +1,35 @@
+{
+  "nav": {
+    "home": "Home",
+    "archive": "Archive",
+    "imprint": "Imprint",
+    "brand_aria": "Go to homepage"
+  },
+  "home": {
+    "greeting": "Hi 🖖 Welcome to my blog 🤗",
+    "latest": "Latest posts",
+    "more_archive": "All posts in the archive →",
+    "empty": "No posts found on the queried relays."
+  },
+  "archive": {
+    "title": "Archive",
+    "subtitle": "All posts, grouped by year.",
+    "doc_title": "Archive – Jörg Lohrer"
+  },
+  "post": {
+    "back_to_overview": "← Back to overview",
+    "untitled": "(untitled)",
+    "published_on": "Published on {date}",
+    "also_available_in": "Also available in:",
+    "not_found": "Post \"{slug}\" not found.",
+    "unknown_error": "Unknown error"
+  },
+  "imprint": {
+    "doc_title": "Imprint – Jörg Lohrer"
+  },
+  "lang": {
+    "de": "German",
+    "en": "English",
+    "switch_aria": "Switch language"
+  }
+}