About typos in general
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Is there a way to automatically proofread English source messages before they reach translatewiki? I'm not saying that TW should require but maybe suggest the use of tools like LanguageTool. Having sentences with errors "breaks" the machine translations.
That's what code review in Gerrit is supposed to be for.
See https://www.mediawiki.org/wiki/Git/Reviewers (I'm not experienced with that page myself, so if you need support with it, ask there).
If you sign up to review this, your help will be strongly appreciated.