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 ikiwiki 's PO files:

gettext: po/underlays/basewiki/ikiwiki/pagespec/po.cs.po: po not a language code
gettext: po/underlays/basewiki/ikiwiki/pagespec/po.da.po: po not a language code
gettext: po/underlays/basewiki/ikiwiki/pagespec/po.de.po: po not a language code
gettext: po/underlays/basewiki/ikiwiki/pagespec/po.es.po: po not a language code
gettext: po/underlays/basewiki/ikiwiki/pagespec/po.fr.po: po not a language code
gettext: po/underlays/directives/ikiwiki/directive/if.da.po: if not a language code
gettext: po/underlays/directives/ikiwiki/directive/if.de.po: if not a language code
gettext: po/underlays/directives/ikiwiki/directive/if.fr.po: if not a language code
gettext: po/underlays/directives/ikiwiki/directive/img.da.po: img not a language code
gettext: po/underlays/directives/ikiwiki/directive/img.de.po: img not a language code
gettext: po/underlays/directives/ikiwiki/directive/img.fr.po: img not a language code
gettext: po/underlays/directives/ikiwiki/directive/osm.de.po: osm 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.