Fix de users i18n key parity broken by a greedy translation (#59)

The `never`/`you` keys had value == key in English; the sed that produced
the German file rewrote the key too. Restores the keys so `pnpm i18n:check`
(the CI test gate) passes.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EwZ4jR4KFAPvpjWevfUGX1

packages/shared/i18n/de/users.json

@@ -19,7 +19,7 @@
     "admin": "Site-Admin",
     "user": "Person"
   },
-  "nie": "never",
+  "never": "nie",
   "actions": {
     "disable": "Deaktivieren",
     "enable": "Aktivieren",
@@ -28,7 +28,7 @@
     "grantAdmin": "Zum Admin machen",
     "revokeAdmin": "Admin entfernen",
     "deleteConfirm": "{{name}} löschen? Die Urheberschaft wird zu „Gelöschte Person“ und der persönliche Teich wandert in den Papierkorb. Nicht rückgängig machbar.",
-    "du": "you"
+    "you": "du"
   },
   "prev": "Zurück",
   "next": "Weiter",