This should be schnazzy since nobody's actually using the LanguagePack stuff in production yet. Otherwise (and just saying this here in case useful for future), the migrations would need to be broken out into:

1. This schema migration file, to create the new LanguagePack model
2. A manually created [data migration](http://south.readthedocs.org/en/latest/tutorial/part3.html#data-migrations) file, to transfer all existing instances over from the old model to the new model
3. A schema migration file to delete the old LanguagePack model.