v0.249.0: i18n slice 1 release B — backup pages in English, Hungarian byte-identical (R-556)

Seven backup pages + the restore-progress JS converted against fixtures captured unconverted
(f8ebc47); recovery renders through executeTemplateLang; English retrieval claims registered;
the Fut comparison left unconverted (R-563).

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

controller/internal/web/recovery_handlers.go

@@ -183,7 +183,7 @@ func (s *Server) renderRecoveryState(w http.ResponseWriter, r *http.Request, err
 		data["InvUnavailable"] = true
 	}
 	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	if err := s.tmpl.ExecuteTemplate(w, "recovery", data); err != nil {
+	if err := s.executeTemplateLang(w, r, "recovery", data); err != nil { // slice 1: the household's language
 		s.logger.Printf("[ERROR] [web] Template error (recovery): %v", err)
 		http.Error(w, "Internal error", http.StatusInternalServerError)
 	}