Returns the first three letters of the day of the week passed to the function
dayOfWeekShortAsString(day_of_week [, locale]) → returns string
dayOfWeekShortAsString(day_of_week [, locale])
→ returns string
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dayOfWeekShortAsString(1)
Expected Result: Sun
dayOfWeekShortAsString(1,"fr")
Expected Result: dim.