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Resolves #7479
The issue finds that we are inconsistent about "greyscale" and "grayscale". This PR addresses "grey" vs "gray" more generally.
Searching, I found that "gray" was used more, so changing the rest to match was the smaller change.
However, I have left ImImagePlugin alone, as it actually writes "Greyscale" into image files.
Pillow/src/PIL/ImImagePlugin.py
Lines 308 to 313 in 0a6fcc2