from the mailing list: http://markmail.org/message/wifsrte2p2q6tces
ok, here's the scoop.
It is possible to add i18n for Isis apps, but the implementation we have reflects the locale of the server, rather than the client.
If client-side i18n is what you require then it ought to be possible to implement a different implementation of I18nFacetDecoratorInstaller. You can get hold of the user's locale using: