When no package for language is present, present dialog.

@ryancarlson What do you think about this? Currently it is possible to have a language show that has no translations even if you are not a translator; however, this will be corrected when GT-53 is merged.
This means that any time the user hits Cancel, he's taken to the settings page.  Did you mean for this to happen only if there are no packages? (verified by testing)