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Fragment of a discussion from Translating talk:MediaWiki/LiquidThreads
I don't think this is worth spending too much time with. It's a very stupid idea of MediaWiki, that it links documentation where it does not exist (on the local wiki). We should work on Bug 43591 – Link translatable help pages on mediawiki.org from the relevant special pages, which is also the approach Translate uses for its own documentation.
I for one would prefer an "if the local page does not exist, then transparently deliver the central page from www.mediawiki.org" approach, mainly resembling the way, pictures are handled and included from Commons if needed.