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Fragment of a discussion from Village pump/en
Humm...
I think we need to create the messages "MediaWiki:Lang/xxx" as was made there, because that is not a default message... See commons:Commons:Administrators'_noticeboard/Archive_11#MediaWiki:Lang. The pages just contain the corresponding language code.
Great, I will create them. Is would be better if was part of the translatewiki.net, and available for all projects.
I just used it for Autotranslate the Template:welcome. It will display the text in your local language if available, or even in some fallback languages (Dutch for Afrikaans).