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 mame 's PO files:

gettext: language/Afrikaans/strings.po: can't guess language
gettext: language/Albanian/strings.po: can't guess language
gettext: language/Arabic/strings.po: can't guess language
gettext: language/Basque/strings.po: can't guess language
gettext: language/Belarusian/strings.po: can't guess language
gettext: language/Bosnian/strings.po: can't guess language
gettext: language/Bulgarian/strings.po: can't guess language
gettext: language/Burmese/strings.po: can't guess language
gettext: language/Catalan/strings.po: can't guess language
gettext: language/Chinese_Simplified/strings.po: can't guess language
gettext: language/Chinese_Traditional/strings.po: can't guess language
gettext: language/Croatian/strings.po: can't guess language
gettext: language/Czech/strings.po: can't guess language
gettext: language/Danish/strings.po: can't guess language
gettext: language/Dutch/strings.po: can't guess language
gettext: language/English/strings.po: can't guess language
gettext: language/Estonian/strings.po: can't guess language
gettext: language/Finnish/strings.po: can't guess language
gettext: language/French/strings.po: can't guess language
gettext: language/French_Belgium/strings.po: can't guess language
gettext: language/French_Canada/strings.po: can't guess language
gettext: language/Georgian/strings.po: can't guess language
gettext: language/German/strings.po: can't guess language
gettext: language/Greek/strings.po: can't guess language
gettext: language/Hebrew/strings.po: can't guess language
gettext: language/Hindi/strings.po: can't guess language
gettext: language/Hungarian/strings.po: can't guess language
gettext: language/Indonesian/strings.po: can't guess language
gettext: language/Italian/strings.po: can't guess language
gettext: language/Japanese/strings.po: can't guess language
gettext: language/Korean/strings.po: can't guess language
gettext: language/Latvian/strings.po: can't guess language
gettext: language/Lithuanian/strings.po: can't guess language
gettext: language/Macedonian/strings.po: can't guess language
gettext: language/Norwegian/strings.po: can't guess language
gettext: language/Persian/strings.po: can't guess language
gettext: language/Polish/strings.po: can't guess language
gettext: language/Portuguese/strings.po: can't guess language
gettext: language/Portuguese_Brazil/strings.po: can't guess language
gettext: language/Romanian/strings.po: can't guess language
gettext: language/Russian/strings.po: can't guess language
gettext: language/Serbian/strings.po: can't guess language
gettext: language/Serbian_Cyrillic/strings.po: can't guess language
gettext: language/Slovak/strings.po: can't guess language
gettext: language/Slovenian/strings.po: can't guess language
gettext: language/Spanish/strings.po: can't guess language
gettext: language/Spanish_Mexico/strings.po: can't guess language
gettext: language/Swedish/strings.po: can't guess language
gettext: language/Thai/strings.po: can't guess language
gettext: language/Turkish/strings.po: can't guess language
gettext: language/Ukrainian/strings.po: can't guess language
gettext: language/Vietnamese/strings.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.