v0.259.0 — the claim page and the backup warnings answer in the reader's language (R-596, R-598)

The 2026-09-20 English drill ended one screen short: the claim page was English
and its answers were Hungarian, so a household who mistyped the code from their
e-mail could not tell a typo from a dead code. Fourteen call sites carrying nine
messages now go through s.msg; the backup page's two protection warnings — which
are promises about whether the customer's files are safe — follow the same route.

Hungarian is byte-identical, proved structurally by the go-parity gate against the
frozen base capture and red-proofed on a single added full stop.

data["Title"] was DEAD (claim.html is standalone; .Title is layout.html's) and is
deleted rather than translated — a translated dead field is a permanent false
signal about where the page's title comes from.

Six existing copy-contract tests were kept, not weakened: each now resolves its key
through the real bundle, so it still convicts on a reworded Hungarian sentence.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/web/handlers.go

@@ -1001,12 +1001,12 @@ func (s *Server) backupsHandler(w http.ResponseWriter, r *http.Request) {
 	data["StorageBars"] = s.buildStorageBars(s.langFor(r))
 
 	// Whole-guest backup view (agent-sourced, read-only) for the "Rendszermentés" section.
-	data["GuestBackup"] = s.loadGuestBackup(r.Context())
+	data["GuestBackup"] = s.loadGuestBackup(r.Context(), s.langFor(r))
 
 	// R-112: the backup-target banner finally has a consumer. nil in the healthy and unknown states,
 	// so the template renders nothing at all — no badge, no reassurance. This is the seam whose
 	// absence made E-2's degraded banner and offer invisible to every customer.
-	data["BackupTarget"] = s.backupTargetView(r.Context())
+	data["BackupTarget"] = s.backupTargetView(r.Context(), s.langFor(r))
 
 	// Customer-configurable backup window (v0.168.0): effective start + derived leg/gate times.
 	s.backupWindowData(data)