UX: banner enabled/disabled posts should be small posts, not full-size posts

app/assets/javascripts/discourse/widgets/post-small-action.js.es6

@@ -16,6 +16,8 @@ const icons = {
   'pinned.disabled': 'thumb-tack unpinned',
   'pinned_globally.enabled': 'thumb-tack',
   'pinned_globally.disabled': 'thumb-tack unpinned',
+  'banner.enabled': 'thumb-tack',
+  'banner.disabled': 'thumb-tack unpinned',
   'visible.enabled': 'eye',
   'visible.disabled': 'eye-slash',
   'split_topic': 'sign-out',

app/models/topic.rb

@@ -833,7 +833,7 @@ SQL
       .update_all(dismissed_banner_key: nil)
 
     self.archetype = Archetype.banner
-    self.add_moderator_post(user, I18n.t("archetypes.banner.message.make"))
+    self.add_small_action(user, "banner.enabled")
     self.save
 
     MessageBus.publish('/site/banner', banner)
@@ -841,7 +841,7 @@ SQL
 
   def remove_banner!(user)
     self.archetype = Archetype.default
-    self.add_moderator_post(user, I18n.t("archetypes.banner.message.remove"))
+    self.add_small_action(user, "banner.disabled")
     self.save
 
     MessageBus.publish('/site/banner', nil)

config/locales/client.en.yml

@@ -162,6 +162,9 @@ en:
       visible:
         enabled: 'listed %{when}'
         disabled: 'unlisted %{when}'
+      banner:
+        enabled: 'made this a banner %{when}. It will appear at the top of every page until it is dismissed by the user.'
+        disabled: 'removed this banner %{when}. It will no longer appear at the top of every page.'
 
     topic_admin_menu: "topic admin actions"