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 golang-github-chai2010-gettext-go 's PO files:

gettext: examples/locale/default/LC_MESSAGES/hello.po: can't guess language
gettext: testdata/gettext-3-1.po: can't guess language
gettext: testdata/gettext-3-2.po: can't guess language
gettext: testdata/gettext-4.po: can't guess language
gettext: testdata/gettext-5.po: can't guess language
gettext: testdata/gettext-6-1.po: can't guess language
gettext: testdata/gettext-6-2.po: can't guess language
gettext: testdata/gettext-7.po: can't guess language
gettext: testdata/mm-ko-comp.euc-kr.po: euc-kr not a language code
gettext: testdata/mm-ko.euc-kr.po: mm-ko not a language code
gettext: testdata/mm-viet.comp.po: can't guess language
gettext: testdata/test.po: can't guess language
gettext: testdata/xg-c-1.ok.po: ok not a language code
      

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.