Add multilang syscheck

Author: Meatballs1

lib/rex/post/meterpreter/ui/console/command_dispatcher/mimikatz.rb

@@ -159,7 +159,11 @@ def get_privs
 	end
 
 	def system_check
-		unless (client.sys.config.getuid == "NT AUTHORITY\\SYSTEM")
+		# Recreate is_system? as it is an MSF method not available to Rex
+		# This adds some foreign language support
+		local_sys = resolve_sid("S-1-5-18")
+		
+		unless (client.sys.config.getuid == "#{local_sys[:domain]}\\#{local_sys[:name]}")
 			print_warning("Not currently running as SYSTEM")
 			return false
 		end