Import of mbox: handle charset=windows-1252 (PR #12832)

When importing the mbox containing this message, it shows like this:

This issue has been reported here by Loic who proposed this patch (but who doesn’t have a GitHub account).

About this patch, @gschlager stated:

Looks like a perfect way of fixing the problem.

GitHub

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@pilou- Could you please sign the CLA?