Change the Exporter invocation in Git::I18N to be compatible with
5.8.0 to 5.8.2 inclusive. Before Exporter 5.57 (released with 5.8.3)
Exporter didn't export the 'import' subroutine.
Reported-by: Tom G. Christensen <tgc@statsbiblioteket.dk> Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>