remove dead language from my preferences

I have "Australian languages" as a preferred language for my launchpad account. This "language" has now been deleted from Rosetta, which is fine as it's not really a language at all. However there's no UI for me to remove it from my account since it doesn't come up in the list.

See also https://launchpad.net/products/rosetta/+bug/30900

Would you please remove the language from my account? Perhaps you should also purge deleted languages from all accounts?