R-522: a disconnected tunnel is told on the dashboard row

Since v0.292.0 (R-841) cloudflared's health check asks /ready, so a lost
connection reads unhealthy; the cloudflared row now also carries the tag
"Kivulrol nem erheto el" with a plain title, in hu+en. New parity case
dashboard_tunnel_offline (born as a key).

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

@@ -904,6 +904,8 @@
   "dashboard.telepites": "Install",
   "dashboard.telepitett_alkalmazasok": "Installed apps",
   "dashboard.url_nem_elerheto": "URL not reachable",
+  "dashboard.tunnel_offline": "Not reachable from outside",
+  "dashboard.tunnel_offline_title": "The secure internet connection is not connected now, so your apps cannot be reached from outside. Check the internet connection.",
   "dashboard.utolso_mentes": "Last backup:",
   "dashboard.vedett": "Protected",
   "dashboard.vezerlopult": "Dashboard",

controller/internal/i18n/locales/hu.json

@@ -899,6 +899,8 @@
   "dashboard.telepites": "Telepítés",
   "dashboard.telepitett_alkalmazasok": "Telepített alkalmazások",
   "dashboard.url_nem_elerheto": "URL nem elérhető",
+  "dashboard.tunnel_offline": "Kívülről nem érhető el",
+  "dashboard.tunnel_offline_title": "A biztonságos internetkapcsolat most nem kapcsolódik, ezért az alkalmazásaid kívülről nem érhetők el. Ellenőrizd az internetkapcsolatot.",
   "dashboard.utolso_mentes": "Utolsó mentés:",
   "dashboard.vedett": "Védett",
   "dashboard.vezerlopult": "Vezérlőpult",