Aggiunge traduzioni it/en/fr/de/es agli avvisi e toglie gli override Android/iOS.

Un avviso ha un testo per lingua; per differenziare le piattaforme si creano due avvisi. L'app riceve già il copy risolto da Accept-Language.

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

backend/spec/requests/admin/announcements_spec.rb

@@ -39,6 +39,42 @@ RSpec.describe "Admin announcements", type: :request do
     expect(response.body).to include(I18n.t("admin.announcements.channels.web_public"))
   end
 
+  it "salva le traduzioni e mostra le schede lingua nel form" do
+    get new_admin_announcement_path
+    expect(response.body).to include(I18n.t("admin.announcements.form.locales_legend"))
+    expect(response.body).to include("English")
+    expect(response.body).to include("Français")
+    expect(response.body).to include("Deutsch")
+    expect(response.body).to include("Español")
+    expect(response.body).not_to include("name=\"app_announcement[android_title]\"")
+    expect(response.body).not_to include("name=\"app_announcement[ios_title]\"")
+
+    post admin_announcements_path, params: {
+      app_announcement: {
+        kind: "info",
+        severity: "info",
+        status: "published",
+        title: "Nuova versione",
+        body: "Aggiorna l'app dallo store.",
+        dismissible: "1",
+        show_on_android: "1",
+        show_on_ios: "1",
+        show_on_web_public: "1",
+        show_on_web_private: "0",
+        translations: {
+          en: { title: "A new version is out", body: "Update the app from the store." },
+          fr: { title: "Nouvelle version", body: "Mettez à jour l'application." }
+        }
+      }
+    }
+
+    expect(response).to redirect_to(admin_announcements_path)
+    notice = AppAnnouncement.last
+    expect(notice.translations["en"]["title"]).to eq("A new version is out")
+    expect(notice.translations["fr"]["title"]).to eq("Nouvelle version")
+    expect(notice.as_api_json(locale: :en)[:title]).to eq("A new version is out")
+  end
+
   it "elimina un avviso" do
     item = AppAnnouncement.create!(
       kind: "info", status: "published", title: "Da togliere", body: "Test"