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IMHO, as for the locales I see such way: newbie came to the main (any) product site and could readily download/discuss main parts - core, locale, plugins. It means that site must have those files and forum topics.
Sorry, but it sounds like some bull$hit marketing. Everyone must use clouds, bootstrap, kickstarter etc. only because it is modern and fashionable. Why everybody think that such way absolutely better, safer and so on for everyone?
Keeping locales on GH makes it easier for everyone, you can update, maintain and publish them much faster and users don't have to search on Google, NSS sites or SourceForge (I'm sure many don't even know that locales can be found at SF)