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/app/controllers/admin/announcements_controller.rb

@@ -57,17 +57,17 @@ module Admin
         :kind, :severity, :status, :title, :body,
         :action_url, :action_label, :dismissible, :starts_at, :ends_at,
         :show_on_android, :show_on_ios, :show_on_web_public, :show_on_web_private,
-        :android_title, :android_body, :android_action_url, :android_action_label,
-        :ios_title, :ios_body, :ios_action_url, :ios_action_label
+        translations: {
+          en: AppAnnouncement::COPY_KEYS,
+          fr: AppAnnouncement::COPY_KEYS,
+          de: AppAnnouncement::COPY_KEYS,
+          es: AppAnnouncement::COPY_KEYS
+        }
       ).tap do |permitted|
         %i[dismissible show_on_android show_on_ios show_on_web_public show_on_web_private].each do |key|
           permitted[key] = ActiveModel::Type::Boolean.new.cast(permitted[key])
         end
-        %i[
-          starts_at ends_at action_url action_label
-          android_title android_body android_action_url android_action_label
-          ios_title ios_body ios_action_url ios_action_label
-        ].each do |key|
+        %i[starts_at ends_at action_url action_label].each do |key|
           permitted[key] = nil if permitted[key].blank?
         end
       end