Add specific rate limits for posting and following (#13172)

config/initializers/rack_attack.rb

@@ -70,7 +70,6 @@ class Rack::Attack
     req.remote_ip if req.post? && req.path == '/api/v1/accounts'
   end
 
-  # Throttle paging, as it is mainly used for public pages and AP collections
   throttle('throttle_authenticated_paging', limit: 300, period: 15.minutes) do |req|
     req.authenticated_user_id if req.paging_request?
   end

config/locales/en.yml

@@ -725,7 +725,7 @@ en:
     '422':
       content: Security verification failed. Are you blocking cookies?
       title: Security verification failed
-    '429': Throttled
+    '429': Too many requests
     '500':
       content: We're sorry, but something went wrong on our end.
       title: This page is not correct