Admin-Seite lokalisiert: Übersetzungen hinzugefügt und URLs angepasst

- Admin-Namespace zu de.json und en.json hinzugefügt
- Alle UI-Texte in der Admin-Seite mit useTranslations lokalisiert
- Link-Komponente von next-intl verwendet für korrekte Locale-URLs
- Buttons, Labels, Formulare und Tabellen-Header übersetzt

messages/en.json

@@ -104,5 +104,52 @@
         "globalTooltip": "A random song from the entire collection",
         "comingSoon": "Coming soon",
         "curatedBy": "Curated by"
+    },
+    "Admin": {
+        "title": "Hördle Admin Dashboard",
+        "login": "Admin Login",
+        "password": "Password",
+        "loginButton": "Login",
+        "logout": "Logout",
+        "manageSpecials": "Manage Specials",
+        "manageGenres": "Manage Genres",
+        "manageNews": "Manage News & Announcements",
+        "uploadSongs": "Upload Songs",
+        "todaysPuzzles": "Today's Daily Puzzles",
+        "show": "▶ Show",
+        "hide": "▼ Hide",
+        "addSpecial": "Add Special",
+        "addGenre": "Add Genre",
+        "addNews": "Add News",
+        "edit": "Edit",
+        "delete": "Delete",
+        "save": "Save",
+        "cancel": "Cancel",
+        "curate": "Curate",
+        "name": "Name",
+        "subtitle": "Subtitle",
+        "maxAttempts": "Max Attempts",
+        "unlockSteps": "Unlock Steps",
+        "launchDate": "Launch Date",
+        "endDate": "End Date",
+        "curator": "Curator",
+        "active": "Active",
+        "newGenreName": "New Genre Name",
+        "editSpecial": "Edit Special",
+        "editGenre": "Edit Genre",
+        "editNews": "Edit News",
+        "newsTitle": "News Title",
+        "content": "Content (Markdown supported)",
+        "author": "Author (optional)",
+        "featured": "Featured",
+        "noSpecialLink": "No Special Link",
+        "noNewsItems": "No news items yet. Create one above!",
+        "noPuzzlesToday": "No daily puzzles found for today.",
+        "category": "Category",
+        "song": "Song",
+        "artist": "Artist",
+        "actions": "Actions",
+        "deletePuzzle": "Delete",
+        "wrongPassword": "Wrong password"
     }
 }