Wrong Language in Unknown Command for Australian English

In Australian English, typing in an 'Unknown Command' comes up with the error message saying "Comando desconocido.Pruebe /help para una lista de comandos."
When in English UK, typing in an Unknown command comes up with the normal english message "Unknown command. Try /help for a list of commands"
Example:
1. Choose Australian English
2. Type unknown command. e.g. "/dogs", or whatever
3. Unknown Command error comes up in wrong language