Completa i18n IT/EN/FR/DE/ES su sito pubblico, area autenticata e admin.

Tutte le view marketing, legali, viewer, dashboard e admin usano t(); mailer utente-facing e flash localizzati; admin con LocaleResolver e selettore lingua.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/controllers/public/replay_controller.rb

@@ -42,7 +42,7 @@ module Public
 
     def download
       unless download_allowed?
-        redirect_to public_replay_path(@session), alert: "Download non disponibile"
+        redirect_to public_replay_path(@session), alert: t("flash.replay.download_unavailable")
         return
       end
 
@@ -105,13 +105,13 @@ module Public
       @recording = Recording.not_deleted.find_by(stream_session: @session)
       return if @recording
 
-      redirect_to public_live_path(@session), alert: "Replay non disponibile"
+      redirect_to public_live_path(@session), alert: t("flash.replay.not_available")
     end
 
     def authorize_replay_access!
       return if Recordings::AccessPolicy.new(@recording, viewer: current_user).allowed?
 
-      redirect_to public_live_index_path, alert: "Replay non disponibile"
+      redirect_to public_live_index_path, alert: t("flash.replay.not_available")
     end
   end
 end