With 1.9.2, the I18n internationalization module does not update available locales after loading more languages in the backend module. In my app we do this as a plug-in and since it can be done in run-time there may need to be some extra steps taken. I doubt this matters for 99% of the people here but just thought I'd give you a heads up if any of you move to 1.9.2 and use I18n dynamically.