Fix/improve formatting of USCustomary.SQUARE_FOOT #210
Description
The symbol for USCustomary.SQUARE_FOOT is currently "sft", but it should be "ft²" instead. As an alias "sq ft", not "sft" should be set.
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The symbol for USCustomary.SQUARE_FOOT is currently "sft", but it should be "ft²" instead. As an alias "sq ft", not "sft" should be set.