commit-graph: mark chunk error messages for translation

commit-graph: mark chunk error messages for translation

The patches from f32af12cee (Merge branch 'jk/chunk-bounds', 2023-10-23)
added many new untranslated error messages. While it's unlikely for most
users to see these messages at all, most of the other commit-graph error
messages are translated (and likewise for the matching midx messages).

Let's mark them all for consistency (and to help any poor unfortunate
user who does manage to find a broken graph file).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>