l10n: po-id for 2.50

l10n: po-id for 2.50

Update following components:

  * builtin/cat-file.c
  * builtin/fast-export.c
  * builtin/fsck.c
  * builtin/merge-tree.c
  * builtin/mv.c
  * builtin/reflog.c
  * builtin/repack.c
  * builtin/rev-list.c
  * builtin/update-ref.c
  * command-list.h
  * midx-write.c
  * object-file.c
  * parse-options.c
  * promisor-remote.c
  * refs/packed-backend.c
  * scalar.c
  * t/helper/test-pack-deltas.c
  * git-send-email.perl

Translate following new components:

  * builtin/diff-pairs.c

Signed-off-by: Bagas Sanjaya <bagasdotme@gmail.com>