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 pingus 's PO files:

source does not specify a priority
gettext: external/tinygettext/test/broken.po: can't guess language
gettext: external/tinygettext/test/level/de.po: warning: Charset "Latin1" is not a portable encoding name.
                                                                                              Message conversion to user's charset might not work.
gettext: external/tinygettext/test/po/de.po: warning: Charset "Latin1" is not a portable encoding name.
                                                                                           Message conversion to user's charset might not work.
      

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.