Add rake task for updating static pages

lib/tasks/topics.rake

@@ -64,3 +64,36 @@ task "topics:apply_autoclose" => :environment do
 
   puts "", "Done"
 end
+
+def update_static_page_topic(locale, site_setting_key, title_key, body_key, params = {})
+  topic = Topic.find(SiteSetting.send(site_setting_key))
+
+  if (topic && post = topic.first_post)
+    post.revise(Discourse.system_user,
+                title: I18n.t(title_key, locale: locale),
+                raw: I18n.t(body_key, params.merge(locale: locale)))
+
+    puts "", "Topic for #{site_setting_key} updated"
+  else
+    puts "", "Topic for #{site_setting_key} not found"
+  end
+end
+
+desc "Update static topics (ToS, Privacy, Guidelines) with latest translated content"
+task "topics:update_static", [:locale] => [:environment] do |_, args|
+  locale = args[:locale]&.to_sym
+
+  if locale.blank? || !I18n.locale_available?(locale)
+    puts "ERROR: Expecting rake topics:update_static[locale]"
+    exit 1
+  end
+
+  update_static_page_topic(locale, "tos_topic_id", "tos_topic.title", "tos_topic.body",
+                           company_domain: SiteSetting.company_domain.presence || "company_domain",
+                           company_full_name: SiteSetting.company_full_name.presence || "company_full_name",
+                           company_name: SiteSetting.company_short_name.presence || "company_short_name")
+
+  update_static_page_topic(locale, "guidelines_topic_id", "guidelines_topic.title", "guidelines_topic.body")
+
+  update_static_page_topic(locale, "privacy_topic_id", "privacy_topic.title", "privacy_topic.body")
+end