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/spec/requests/public/i18n_pages_spec.rb

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+require "rails_helper"
+
+RSpec.describe "Public i18n pages", type: :request do
+  it "mostra privacy in inglese con cookie mltv_locale" do
+    cookies[:mltv_locale] = "en"
+    get public_privacy_path
+    expect(response).to have_http_status(:ok)
+    expect(response.body).to include("Notice on the processing of personal data")
+    expect(response.body).not_to include("Informativa sul trattamento")
+  end
+
+  it "mostra login in francese" do
+    cookies[:mltv_locale] = "fr"
+    get public_login_path
+    expect(response).to have_http_status(:ok)
+    expect(response.body).to include("Connexion")
+    expect(response.body).not_to include("translation missing")
+  end
+
+  it "mostra features in tedesco" do
+    cookies[:mltv_locale] = "de"
+    get public_features_path
+    expect(response).to have_http_status(:ok)
+    expect(response.body).not_to include("translation missing")
+  end
+end