FEATURE: Locale support for seeded categories and topics (#7110)

lib/introduction_updater.rb

@@ -29,11 +29,9 @@ class IntroductionUpdater
   end
 
   def find_welcome_post
-    topic_id = TopicCustomField
-      .where(name: "is_welcome_topic", value: "true")
-      .pluck(:topic_id)
+    topic_id = SiteSetting.welcome_topic_id
 
-    if topic_id.blank?
+    if topic_id <= 0
       title = I18n.t("discourse_welcome_topic.title")
       topic_id = find_topic_id(title)
     end