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 neutron 's PO files:

debconf: debian/neutron-common.templates.in:1: Wrong input line:
 # These templates have been reviewed by the debian-l10n-english
debconf: debian/neutron-common.templates.in:2: Wrong input line:
 # team
debconf: debian/neutron-common.templates.in:3: Wrong input line:
 #
debconf: debian/neutron-common.templates.in:4: Wrong input line:
 # If modifications/additions/rewording are needed, please ask
debconf: debian/neutron-common.templates.in:5: Wrong input line:
 # debian-l10n-english@lists.debian.org for advice.
debconf: debian/neutron-common.templates.in:6: Wrong input line:
 #
debconf: debian/neutron-common.templates.in:7: Wrong input line:
 # Even minor modifications require translation updates and such
debconf: debian/neutron-common.templates.in:8: Wrong input line:
 # changes should be coordinated with translators and reviewers.
debconf: debian/neutron-common.templates.in:13: Wrong input line:
 _Description: Manage nova config through debconf?
debconf: debian/neutron-common.templates.in:14: Wrong input line:
  Neutron service must contact Nova, and this is configured through
debconf: debian/neutron-common.templates.in:15: Wrong input line:
  the [nova] section of the configuration. Specify if you wish
debconf: debian/neutron-common.templates.in:16: Wrong input line:
  to handle this configuration through debconf.
debconf: debian/neutron-common.templates.in:21: Wrong input line:
 _Description: Nova keystone auth URL:
debconf: debian/neutron-common.templates.in:22: Wrong input line:
  Neutron needs to be able to communicate with Nova through Keystone. Therefore
debconf: debian/neutron-common.templates.in:23: Wrong input line:
  Neutron needs to know the Nova admin tenant name, username, password and region.
debconf: debian/neutron-common.templates.in:24: Wrong input line:
  .
debconf: debian/neutron-common.templates.in:25: Wrong input line:
  Please enter the URL of keystone auth_url for Nova.
debconf: debian/neutron-common.templates.in:30: Wrong input line:
 _Description: Nova server region name:
debconf: debian/neutron-common.templates.in:31: Wrong input line:
  Neutron needs to be able to communicate with Nova through Keystone. Therefore
debconf: debian/neutron-common.templates.in:32: Wrong input line:
  Neutron needs to know the Nova admin tenant name, username, password and region.
debconf: debian/neutron-common.templates.in:33: Wrong input line:
  .
debconf: debian/neutron-common.templates.in:34: Wrong input line:
  Please enter the region of the admin tenant for Nova.
debconf: debian/neutron-common.templates.in:39: Wrong input line:
 _Description: Nova admin tenant name:
debconf: debian/neutron-common.templates.in:40: Wrong input line:
  Neutron needs to be able to communicate with Nova through Keystone. Therefore
debconf: debian/neutron-common.templates.in:41: Wrong input line:
  Neutron needs to know the Nova admin tenant name, username, password and region.
debconf: debian/neutron-common.templates.in:42: Wrong input line:
  .
debconf: debian/neutron-common.templates.in:43: Wrong input line:
  Please enter the name of the admin tenant for Nova.
debconf: debian/neutron-common.templates.in:48: Wrong input line:
 _Description: Nova service username:
debconf: debian/neutron-common.templates.in:49: Wrong input line:
  Neutron needs to be able to communicate with Nova through Keystone. Therefore
debconf: debian/neutron-common.templates.in:50: Wrong input line:
  Neutron needs to know the Nova admin tenant name, username, password and region.
debconf: debian/neutron-common.templates.in:51: Wrong input line:
  .
debconf: debian/neutron-common.templates.in:52: Wrong input line:
  Please enter the username of the admin tenant for Nova.
debconf: debian/neutron-common.templates.in:56: Wrong input line:
 _Description: Nova administrator password:
debconf: debian/neutron-common.templates.in:57: Wrong input line:
  Neutron needs to be able to communicate with Nova through Keystone. Therefore
debconf: debian/neutron-common.templates.in:58: Wrong input line:
  Neutron needs to know the Nova admin tenant name, username, password and region.
debconf: debian/neutron-common.templates.in:59: Wrong input line:
  .
debconf: debian/neutron-common.templates.in:60: Wrong input line:
  Please enter the password of the admin tenat for Nova.
podebconf: file debian/po/templates.pot not found
podebconf: file debian/po/POTFILES.in not found
debconf: debian/neutron-metadata-agent.templates:1: Wrong input line:
 # These templates have been reviewed by the debian-l10n-english
debconf: debian/neutron-metadata-agent.templates:2: Wrong input line:
 # team
debconf: debian/neutron-metadata-agent.templates:3: Wrong input line:
 #
debconf: debian/neutron-metadata-agent.templates:4: Wrong input line:
 # If modifications/additions/rewording are needed, please ask
debconf: debian/neutron-metadata-agent.templates:5: Wrong input line:
 # debian-l10n-english@lists.debian.org for advice.
debconf: debian/neutron-metadata-agent.templates:6: Wrong input line:
 #
debconf: debian/neutron-metadata-agent.templates:7: Wrong input line:
 # Even minor modifications require translation updates and such
debconf: debian/neutron-metadata-agent.templates:8: Wrong input line:
 # changes should be coordinated with translators and reviewers.
debconf: debian/neutron-metadata-agent.templates:13: Wrong input line:
 _Description: Manage Neutron metadata config through debconf?
debconf: debian/neutron-metadata-agent.templates:14: Wrong input line:
  Neutron Metadata service must be configured to contact Nova.
debconf: debian/neutron-metadata-agent.templates:15: Wrong input line:
  Specify if you wish to handle this configuration through debconf.
debconf: debian/neutron-metadata-agent.templates:19: Wrong input line:
 _Description: Metadata proxy shared secret:
debconf: debian/neutron-metadata-agent.templates:20: Wrong input line:
  VM instances using Neutron to handle networking retrieve their metadata
debconf: debian/neutron-metadata-agent.templates:21: Wrong input line:
  through the Neutron metadata agent, which serves as a proxy to the Nova
debconf: debian/neutron-metadata-agent.templates:22: Wrong input line:
  metadata REST API server.
debconf: debian/neutron-metadata-agent.templates:23: Wrong input line:
  .
debconf: debian/neutron-metadata-agent.templates:24: Wrong input line:
  Please enter the password that should be used to protect communications
debconf: debian/neutron-metadata-agent.templates:25: Wrong input line:
  between the Neutron metadata proxy agent and the Nova metadata server. The
debconf: debian/neutron-metadata-agent.templates:26: Wrong input line:
  same shared password should be used when setting up the nova-common
debconf: debian/neutron-metadata-agent.templates:27: Wrong input line:
  package.
debconf: debian/neutron-metadata-agent.templates:32: Wrong input line:
 _Description: Nova metadata host:
debconf: debian/neutron-metadata-agent.templates:33: Wrong input line:
  VM instances using Neutron to handle networking retrieve their metadata
debconf: debian/neutron-metadata-agent.templates:34: Wrong input line:
  through the Neutron metadata agent, which serves as a proxy to the Nova
debconf: debian/neutron-metadata-agent.templates:35: Wrong input line:
  metadata REST API server.
debconf: debian/neutron-metadata-agent.templates:36: Wrong input line:
  .
debconf: debian/neutron-metadata-agent.templates:37: Wrong input line:
  Please enter the host of Nova metadata server.
podebconf: file debian/po/templates.pot not found
podebconf: file debian/po/POTFILES.in not found
debconf: debian/neutron-openvswitch-agent.templates:4: Wrong input line:
 _Description: Neutron overlay interface ip address:
debconf: debian/neutron-openvswitch-agent.templates:5: Wrong input line:
  Neutron overlay interface ip address.
podebconf: file debian/po/templates.pot not found
podebconf: file debian/po/POTFILES.in not found
      

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.