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 amarok 's PO files:

gettext: poqm/ar/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/bg/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/bs/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ca/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ca@valencia/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/cs/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/da/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/de/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/el/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/en_GB/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/eo/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/es/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/et/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/eu/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/fa/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/fi/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/fr/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ga/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/gl/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/he/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/hr/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/hu/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ia/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/id/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/it/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ja/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ka/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/km/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ko/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/lt/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/lv/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/mai/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/mr/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/nb/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/nds/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/nl/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/nn/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/pa/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/pl/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/pt/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/pt_BR/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ro/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ru/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/se/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/sk/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/sl/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/sq/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/sr/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/sr@ijekavian/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/sr@ijekavianlatin/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/sr@latin/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/sv/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/tr/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/ug/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/uk/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/wa/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/zh_CN/amarokcollectionscanner_qt.po: qt not a language code
gettext: poqm/zh_TW/amarokcollectionscanner_qt.po: qt 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.