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/mailers/user_mailer.rb

@@ -6,6 +6,8 @@ class UserMailer < ApplicationMailer
     @reset_url = public_password_reset_url(token: token)
     @expiry_hours = MatchLiveTv.password_reset_expiry_hours
 
-    mail to: user.email, subject: "Reimposta la password — Match Live TV"
+    I18n.with_locale(I18n.locale) do
+      mail to: user.email, subject: t("mailers.password_reset.subject")
+    end
   end
 end