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 ruby-gettext 's PO files:

gettext: samples/po/uk/hello_plural.edit.po:28: 'msgid' and 'msgstr[0]' entries do not both end with '\n'
msgfmt: found 3 fatal errors
gettext: samples/po/uk/hello_plural.po:27: 'msgid' and 'msgstr[0]' entries do not both end with '\n'
msgfmt: found 3 fatal errors
gettext: test/po/fr_BE_Foo/test1.po: can't guess language
gettext: test/po/ir/plural.po: ir not a language code
gettext: test/po/po/plural.po: po not a language code
gettext: test/po/zh_Hant/test1.po: can't guess language
gettext: test/tools/files/en/test.po: can't guess language
gettext: test/tools/files/simple_1.po: can't guess language
gettext: test/tools/files/simple_2.po: can't guess language
gettext: test/tools/files/version.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.