add titles to more pages

apps/topics.lua

@@ -53,7 +53,7 @@ app:get("topic_create", "/create", function(self)
     return {status = 403}
   end
 
-  self.page_title = "creating topic"
+  self.page_title = "creating a topic"
   self.me = user
 
   return {render = "topics.create"}