Statistics of level 1 packages for Japanese in unstable:
Read http://d-i.debian.org/l10n-stats

Outdated:

Translated:
  zipl-installer/*/debian/po/ja.po 1t [ Kenshi Muto]
  user-setup/*/debian/po/ja.po 31t [ Kenshi Muto]
  tzsetup/*/debian/po/ja.po 126t [ Kenshi Muto]
  s390-netdevice/*/debian/po/ja.po 29t [ Kenshi Muto]
  s390-dasd/*/debian/po/ja.po 16t [ Kenshi Muto]
  rescue/*/debian/po/ja.po 41t [ Kenshi Muto]
  preseed/*/debian/po/ja.po 15t [ Kenshi Muto]
  pkgsel/*/debian/po/ja.po 12t [ Kenshi Muto]
  partman-iscsi/*/debian/po/ja.po 24t [ Kenshi Muto]
  partman-xfs/*/debian/po/ja.po 2t [ Kenshi Muto]
  partman-target/*/debian/po/ja.po 25t [ Kenshi Muto]
  partman-partitioning/*/debian/po/ja.po 60t [YOSHINO Yoshihito]
  partman-nbd/*/debian/po/ja.po 19t [ Kenshi Muto]
  partman-md/*/debian/po/ja.po 58t [Nozomu KURASAWA]
  partman-lvm/*/debian/po/ja.po 112t [ Kenshi Muto]
  partman-jfs/*/debian/po/ja.po 8t [ Kenshi Muto]
  partman-ext3/*/debian/po/ja.po 14t [ Kenshi Muto]
  partman-efi/*/debian/po/ja.po 10t [Nozomu KURASAWA]
  partman-crypto/*/debian/po/ja.po 98t [ Kenshi Muto]
  partman-btrfs/*/debian/po/ja.po 8t [ Kenshi Muto]
  partman-basicmethods/*/debian/po/ja.po 13t [ Kenshi Muto]
  partman-basicfilesystems/*/debian/po/ja.po 84t [ Kenshi Muto]
  partman-base/*/debian/po/ja.po 68t [ Kenshi Muto]
  partman-auto-raid/*/debian/po/ja.po 5t [ Kenshi Muto]
  partman-auto-lvm/*/debian/po/ja.po 30t [YOSHINO Yoshihito]
  partman-auto-crypto/*/debian/po/ja.po 1t [ Kenshi Muto]
  partman-auto/*/debian/po/ja.po 24t [ Kenshi Muto]
  nobootloader/*/debian/po/ja.po 15t [ Kenshi Muto]
  network-console/*/debian/po/ja.po 24t [ Kenshi Muto]
  netcfg/*/debian/po/ja.po 123t [Nozomu KURASAWA]
  net-retriever/*/debian/po/ja.po 6t [ Kenshi Muto]
  media-retriever/*/debian/po/ja.po 13t [ Kenshi Muto]
  mdcfg/*/debian/po/ja.po 43t [ Kenshi Muto]
  main-menu/*/debian/po/ja.po 6t [ Kenshi Muto]
  lvmcfg/*/debian/po/ja.po 80t [ Kenshi Muto]
  localechooser/*/debian/po/ja.po 45t [ Kenshi Muto]
  iso-scan/*/debian/po/ja.po 31t [ Kenshi Muto]
  installation-report/*/debian/po/ja.po 20t [ Kenshi Muto]
  hw-detect/*/debian/po/ja.po 43t [ Kenshi Muto]
  grub-installer/*/debian/po/ja.po 57t [Nozomu KURASAWA]
  flash-kernel/*/debian/po/ja.po 6t [ Kenshi Muto]
  finish-install/*/debian/po/ja.po 9t [ Kenshi Muto]
  debian-installer-utils/*/debian/po/ja.po 14t [ Kenshi Muto]
  console-setup/*/debian/po/ja.po 179t [Nozomu KURASAWA]
  clock-setup/*/debian/po/ja.po 15t [Nozomu KURASAWA]
  choose-mirror/*/debian/po/ja.po 40t [ Kenshi Muto]
  cdrom-retriever/*/debian/po/ja.po 3t [Nozomu KURASAWA]
  cdrom-detect/*/debian/po/ja.po 29t [YOSHINO Yoshihito]
  cdrom-checker/*/debian/po/ja.po 20t [Nozomu KURASAWA]
  cdebconf-terminal/*/debian/po/ja.po 2t [ Kenshi Muto]
  cdebconf-entropy/*/debian/po/ja.po 5t [ Kenshi Muto]
  cdebconf/*/debian/po/ja.po 44t [Nozomu KURASAWA]
  base-installer/*/debian/po/ja.po 94t [YOSHINO Yoshihito]
  apt-setup/*/debian/po/ja.po 72t [YOSHINO Yoshihito]
  anna/*/debian/po/ja.po 12t [Nozomu KURASAWA]

Missing files:


Global statistics: 1984t0f0u (100%)     (total strings: 1984=100%)
(From all ja.po files)