Change spellchecking to require US English

[cake-pie]

Is your feature request related to a problem? Please describe.

User-facing text is mostly standardize to use US spelling instead of UK or other locales.

We have a spellchecker tool based on top of pyspellchecker that runs on PRs, but it does not differentiate between American, British or other spelling variations.

Solution you would like.

We have a custom wordlist that adds words that are not already in the base dictionary.

Add a wordlist of non-US spellings (colour, sulphur, etc) that we want to exclude, even if they are in the base dictionary.

See: https://pyspellchecker.readthedocs.io/en/latest/quickstart.html#adding-and-removing-terms-from-a-dictionary

Describe alternatives you have considered.

I hoped that this would be something that could be easily fixed by changing a configuration setting somewhere, but pyspellchecker doesn't have that; there aren't separate en-US vs en-GB dictionaries -- looks like its dictionaries are just made by ingesting some large corpus of text and tabulating word frequencies.

Additional context

No response

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