R-585 (part): three producers follow the household's language

db_dump_failed, the off-box backup_failed and offbox_enlarge_blocked
(whose sentence IS the household's mail - no hub customerMessages entry)
now take facts and push a bundle key, so an English household reads
English. Hungarian bytes unchanged (go-parity). Added to
convertedProducers.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/i18n/locales/en.json

@@ -1430,6 +1430,9 @@
   "event.crossdrive_completed": "Second backup copy finished: %s",
   "event.crossdrive_failed": "Second backup copy failed: %s",
   "event.db_dump_completed": "Database backup finished",
+  "event.db_dump_failed": "Database backup failed",
+  "event.offbox_backup_failed": "Off-box (NAS) backup failed",
+  "event.offbox_enlarge_blocked": "The full remote backup of %s (~%s) would go over the storage quota (%d/%d GB). The configuration and the database are still backed up; contact us for a larger quota.",
   "event.disaster_recovery_completed": "Disaster recovery finished (%d succeeded, %d failed)",
   "event.disaster_recovery_started": "Disaster recovery started (%d app(s))",
   "event.health_critical": "System health is critical (was: %s)",

controller/internal/i18n/locales/hu.json

@@ -1421,6 +1421,9 @@
   "event.crossdrive_completed": "Másodlagos mentés elkészült: %s",
   "event.crossdrive_failed": "Másodlagos mentés sikertelen: %s",
   "event.db_dump_completed": "Adatbázis mentés elkészült",
+  "event.db_dump_failed": "Adatbázis mentés sikertelen",
+  "event.offbox_backup_failed": "Off-box (NAS) mentés sikertelen",
+  "event.offbox_enlarge_blocked": "A(z) %s teljes távoli mentése (~%s) túllépné a tárhelykeretet (%d/%d GB). A konfiguráció és az adatbázis továbbra is mentésre kerül; nagyobb kerethez vedd fel velünk a kapcsolatot.",
   "event.disaster_recovery_completed": "Katasztrófa helyreállítás befejezve (%d sikeres, %d sikertelen)",
   "event.disaster_recovery_started": "Katasztrófa helyreállítás elindítva (%d alkalmazás)",
   "event.health_critical": "Rendszer állapot kritikus (volt: %s)",

controller/internal/notify/message_customer_test.go

@@ -62,6 +62,10 @@ func convertedProducers() []struct {
 			n.NotifyHealthChange("ok", nil, nil)
 		}},
 		{"db_dump_completed", func(n *Notifier) { n.NotifyDBDumpCompleted(DBDumpDetails{}) }},
+		// R-585: three of the six producers that sent Hungarian only.
+		{"db_dump_failed", func(n *Notifier) { n.NotifyDBDumpFailed("pg_dump: exit 1") }},
+		{"backup_failed_offbox", func(n *Notifier) { n.NotifyOffboxBackupFailed("a NAS nem elerheto") }},
+		{"offbox_enlarge_blocked", func(n *Notifier) { n.NotifyOffboxEnlargeBlocked("immich", "120 GB", 80, 100) }},
 		{"controller_updated", func(n *Notifier) { n.NotifyControllerUpdated("0.255.0", "0.256.0", true) }},
 		{"controller_update_failed", func(n *Notifier) { n.NotifyControllerUpdated("0.255.0", "0.256.0", false) }},
 		{"controller_started", func(n *Notifier) { n.NotifyControllerStarted("0.256.0", nil) }},

controller/internal/notify/notifier.go

@@ -483,8 +483,17 @@ func (n *Notifier) NotifyBackupRunFailures(message string, d BackupRunFailuresDe
 // body). NOTE: the event type "offbox_enlarge_blocked" must be added to the hub's allowedEventTypes +
 // customerMessages for delivery (a hub-side task, flagged — until then the hub 400s/drops it and the
 // in-dashboard LastWarning + /backups/remote note carry the message).
-func (n *Notifier) NotifyOffboxEnlargeBlocked(message string) {
-	n.PushEvent("offbox_enlarge_blocked", "warning", message, nil)
+//
+// R-585: it takes the FACTS, not a finished sentence, so the sentence follows the household's language —
+// this type has no customerMessages entry on the hub, so its sentence IS the household's mail.
+func (n *Notifier) NotifyOffboxEnlargeBlocked(stack, estimate string, usedGB, quotaGB int) {
+	n.pushEventMsg("offbox_enlarge_blocked", "warning", "event.offbox_enlarge_blocked", nil, stack, estimate, usedGB, quotaGB)
+}
+
+// NotifyOffboxBackupFailed is the off-box (NAS / off-site) run's failure — a `backup_failed` event whose
+// headline follows the household's language (R-585). detail is the sanitised cause (OffsiteFailureMessage).
+func (n *Notifier) NotifyOffboxBackupFailed(detail string) {
+	n.pushEventMsg("backup_failed", "error", "event.offbox_backup_failed", BackupDetails{Error: detail})
 }
 
 // (NotifyBackupCompleted removed 2026-06-16 — the backup_completed event had no callers
@@ -493,8 +502,9 @@ func (n *Notifier) NotifyOffboxEnlargeBlocked(message string) {
 // below are still emitted and consumed.)
 
 // NotifyDBDumpFailed sends a DB dump failure event.
-func (n *Notifier) NotifyDBDumpFailed(message, errMsg string) {
-	n.PushEvent("db_dump_failed", "error", message, DBDumpDetails{Error: errMsg})
+// R-585: the headline is a bundle key, so it follows the household's language; errMsg is the cause.
+func (n *Notifier) NotifyDBDumpFailed(errMsg string) {
+	n.pushEventMsg("db_dump_failed", "error", "event.db_dump_failed", DBDumpDetails{Error: errMsg})
 }
 
 // NotifyDBDumpCompleted sends a DB dump success event.