[MlMt] Modifying Reply Date Format

[MlMt at rhp.tw]

When one replies to an email, MailMate formats the date/time like so `On 
10 Jun 2020, at 16:18...` While I understand that is how most of the 
world references dates and times, I am one of those uncouth Americans 
and wondering if there is a way to change the format?
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