updated english translation

Author: johnpaulashenfelter

config/locales/client.en.yml

@@ -1050,8 +1050,8 @@ en:
         critical_available: "A critical update is available."
         updates_available: "Updates are available."
         please_upgrade: "Please upgrade!"
-        no_check_performed: "A check for updates has not been performed. Ensure clockwork and sidekiq are running."
-        stale_data: "A check for updates has not been performed lately. Ensure clockwork and sidekiq are running."
+        no_check_performed: "A check for updates has not been performed. Ensure sidekiq is running."
+        stale_data: "A check for updates has not been performed lately. Ensure sidekiq is running."
         installed_version: "Installed"
         latest_version: "Latest"
         problems_found: "Some problems have been found with your installation of Discourse:"