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 postgis 's PO files:

gettext: doc/po/de/using_postgis_dataman.xml.po:1089: duplicate message definition...
doc/po/de/using_postgis_dataman.xml.po:390: ...this is the location of the first definition
msgfmt: found 1 fatal error
gettext: doc/po/es/using_postgis_dataman.xml.po:1092: duplicate message definition...
doc/po/es/using_postgis_dataman.xml.po:393: ...this is the location of the first definition
msgfmt: found 1 fatal error
gettext: doc/po/fr/using_postgis_dataman.xml.po:1091: duplicate message definition...
doc/po/fr/using_postgis_dataman.xml.po:392: ...this is the location of the first definition
msgfmt: found 1 fatal error
gettext: doc/po/templates/using_postgis_dataman.xml.pot:1081: duplicate message definition...
doc/po/templates/using_postgis_dataman.xml.pot:383: ...this is the location of the first definition
msgfmt: found 1 fatal error
      

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.