feat: policy-controlled push relay URL with optional user lock

locales/cs/common.json

@@ -955,6 +955,8 @@
         "reenable": "Znovu zaregistrovat",
         "relay_desc": "Výchozí je hostovaný relay Bulwark. Změňte pouze pokud používáte vlastní hosting.",
         "relay_label": "Push relay",
+        "relay_locked": "Nastaveno administrátorem",
+        "relay_locked_desc": "URL push relay byla nastavena administrátorem a nelze ji změnit.",
         "relay_placeholder": "https://notifications.relay.example.com",
         "status_active": "Aktivní na tomto zařízení",
         "status_busy": "Pracuji…",

locales/en/common.json

@@ -927,6 +927,8 @@
         "description": "Receive system notifications for new mail when this site is closed. Delivered via the Bulwark push relay; the relay never sees mail content.",
         "relay_label": "Push relay",
         "relay_desc": "Defaults to the hosted Bulwark relay. Change only if you self-host.",
+        "relay_locked": "Set by administrator",
+        "relay_locked_desc": "The push relay URL has been set by your administrator and cannot be changed.",
         "relay_placeholder": "https://notifications.relay.example.com",
         "status_active": "Active on this device",
         "status_inactive": "Not enabled on this device",

locales/nl/common.json

@@ -955,6 +955,8 @@
         "reenable": "Opnieuw registreren",
         "relay_desc": "Gebruikt standaard de gehoste Bulwark-relay. Wijzig alleen als je zelf hostt.",
         "relay_label": "Push-relay",
+        "relay_locked": "Ingesteld door beheerder",
+        "relay_locked_desc": "De push-relay-URL is ingesteld door je beheerder en kan niet worden gewijzigd.",
         "relay_placeholder": "https://notifications.relay.example.com",
         "status_active": "Actief op dit apparaat",
         "status_busy": "Bezig…",