... as opposed to multiple apps, each with a different locale.

Why?

  1. If these are free apps, then each language will count towards your free app quota (you get 5 free apps that you don't need to pay certification costs for)
  2. Regardless of price, each app will need to go through independent certification (which will then take longer for all apps to be released), instead of one app being certified and published with all languages

Happy App Hubbing!