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Hi Coombe, regarding you edit (https://translatewiki.net/w/i.php?title=MediaWiki:Donate_interface-problemsdonating/pt&curid=2547595&diff=9909702&oldid=4038431) the proofreader you mention must be Brazilian, not Portuguese, so they should be proofreading the messages in the /pt-br language code, not in the /pt language code.
In the unlikely event that they happen to be in fact Portuguese, please direct them to a Portuguese dictionary (https://www.infopedia.pt/dicionarios/lingua-portuguesa/) to learn the difference beteewn donativo and doação. In this case, this person should not be proofreading at all.
Best regards.