rename some config keys to clarify what they are

app/controllers/application_controller.rb

@@ -32,8 +32,8 @@ protected
     response.headers["Access-Control-Allow-Origin"] = "*"
   end
 
-  def require_shared_key
-    unless params[:key] == Danbooru.config.shared_remote_key
+  def require_reportbooru_key
+    unless params[:key] == Danbooru.config.reportbooru_key
       render(text: "forbidden", status: 403)
       return false
     end

app/controllers/related_tags_controller.rb

@@ -1,6 +1,6 @@
 class RelatedTagsController < ApplicationController
   respond_to :json
-  before_filter :require_shared_key, only: [:update]
+  before_filter :require_reportbooru_key, only: [:update]
 
   def show
     @query = RelatedTagQuery.new(params[:query].to_s.downcase, params[:category])