Add a way to flag a topic

app/serializers/site_serializer.rb

@@ -12,6 +12,7 @@ class SiteSerializer < ApplicationSerializer
 
   has_many :categories, serializer: BasicCategorySerializer, embed: :objects
   has_many :post_action_types, embed: :objects
+  has_many :topic_flag_types, serializer: TopicFlagTypeSerializer, embed: :objects
   has_many :trust_levels, embed: :objects
   has_many :archetypes, embed: :objects, serializer: ArchetypeSerializer
 
@@ -31,7 +32,7 @@ class SiteSerializer < ApplicationSerializer
   def periods
     TopTopic.periods.map(&:to_s)
   end
-  
+
   def top_menu_items
     Discourse.top_menu_items.map(&:to_s)
   end