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Language and "Do not check spelling or grammar" are style formatting in Word, not per-document settings. This wouldn't be a big issue if it was simple to select everything in a document and set both of the style properties, but Ctrl+A doesn't always work and if you're googling this you know damn well it doesn't.
The links below explain the problem and give the kernel of a solution, although I found it useful to explicitly set the language and (more of an issue) found that errors would prevent looping through some of the styles unless forcibly ignored.
https://answers.microsoft.com/en-us/mac/forum/macoffice2011-macword/how-can-i-get-word-to-omit-words-styled-in-a/1aaef559-9053-440f-be0c-3bc3e58cd773
https://wordribbon.tips.net/T008135_Ensuring_that_Spell_Checking_is_Enabled_in_All_Styles.html
Sub FixProofingInStyles()
ActiveDocument.Range.LanguageID = wdEnglishUK
On Error Resume Next
For Each objStyle In ActiveDocument.Styles
objStyle.NoProofing = False
Next objStyle
On Error GoTo 0
End Sub
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