Ignore non-ascii follow-up trailers

The trailer *names* should always be ascii. While it is possible to
imagine that some project would have non-ascii trailer names like:

    Signalé-par: Developpeur Un <d1@example.com>
    Co-développé-avec: Developpeur Deux <d2@example.com>

Nonetheless, I am not aware of any project doing this, and this allows
us to weed out a bunch of false-positives from bad forwards.

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

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