Error when generating invite codes for a confirmed remote cluster (#28337)

server/i18n/en.json

@@ -2754,6 +2754,10 @@
     "id": "api.remote_cluster.encrypt_invite_error",
     "translation": "Could not encrypt the remote cluster invite using the provided password"
   },
+  {
+    "id": "api.remote_cluster.generate_invite_cluster_is_confirmed",
+    "translation": "Cannot generate invite code for a confirmed cluster"
+  },
   {
     "id": "api.remote_cluster.get.app_error",
     "translation": "We encountered an error retrieving a secure connection."