About [[MediaWiki:Changeauthor-explanation-single/en]] and [[MediaWiki:Changeauthor-explanation-multi/en]]
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Fragment of a discussion from Translating talk:MediaWiki/LiquidThreads
:) Yes, this is a possible and pragmatic alternative approach. I believe this would be better than the existing message since this definitively helps avoiding discrepancies between the translations.
However, you must be sure that's actually the position in all cases.