British and American spelling differences

[adam-ah]

I noticed that some en-GB spellings are present in the dataset (e.g., "centre"), but some are missing ("mitre saw"), even though their en-US spelling counterpart is part of the dictionary ("miter saw").

I was wondering what would be the best way to add all of these differences as well to the API?
They do follow a set of rules (in the examples above swapping "tre" and "ter"), so I presume it could be mass-fixed?

What are your thoughts?