Add "public" setting to contests

config/locales/en.yml

@@ -47,6 +47,7 @@ en:
       contest:
         lang: Language for the public scoreboard
         name: Name
+        public: Enable the public scoreboard
         team: Team contest
         team_description: For UI display purposes mainly
         allow_registration: Allow registration
@@ -141,6 +142,7 @@ en:
       add_puzzle: Add puzzle
       copy_extension_url: Copy the URL for connecting from the browser extension
       open_public_scoreboard: Open public scoreboard
+      public_scoreboard_disabled: The public scoreboard is disabled
       url_copied: URL copied to the clipboard
   contestants:
     convert_csv: