You can check if a PO file is valid with the following command:

        msgfmt -c -o /dev/null <po file>
      

The following errors were found in puppet-agent 's PO files:

gettext: locales/en/puppet.po: can't guess language
gettext: modules/puppetlabs-augeas_core-1.4.0/locales/ja/puppetlabs-augeas_core.po: can't guess language
gettext: modules/puppetlabs-cron_core-1.2.1/locales/ja/puppetlabs-cron_core.po: can't guess language
gettext: modules/puppetlabs-host_core-1.2.0/locales/ja/puppetlabs-host_core.po: can't guess language
gettext: modules/puppetlabs-mount_core-1.2.0/locales/ja/puppetlabs-mount_core.po: can't guess language
gettext: modules/puppetlabs-selinux_core-1.3.0/locales/ja/puppetlabs-selinux_core.po: can't guess language
gettext: modules/puppetlabs-sshkeys_core-2.4.0/locales/ja/puppetlabs-sshkeys_core.po: can't guess language
gettext: modules/puppetlabs-yumrepo_core-2.0.0/locales/ja/puppetlabs-yumrepo_core.po: can't guess language
gettext: modules/puppetlabs-zfs_core-1.4.0/locales/ja/puppetlabs-zfs_core.po: can't guess language
gettext: modules/puppetlabs-zone_core-1.1.0/locales/ja/puppetlabs-zone_core.po: can't guess language
gettext: spec/fixtures/integration/l10n/envs/prod/modules/demo/locales/ja/puppet-l10n.po: can't guess language
      

Please ask the translator (identified by the Last-Translator field in the PO file), the language team (identified by the Language-Team field) or debian-i18n for a fix.