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 blender 's PO files:

source does not specify a priority
gettext: locale/po/ur.po:48962: 'msgid' and 'msgstr' entries do not both begin with '\n'
locale/po/ur.po:85505: 'msgid' and 'msgstr' entries do not both begin with '\n'
locale/po/ur.po:121504: 'msgid' and 'msgstr' entries do not both begin with '\n'
locale/po/ur.po:126284: 'msgid' and 'msgstr' entries do not both begin with '\n'
locale/po/ur.po:126304: 'msgid' and 'msgstr' entries do not both begin with '\n'
locale/po/ur.po:126755: 'msgid' and 'msgstr' entries do not both begin with '\n'
locale/po/ur.po:129162: 'msgid' and 'msgstr' entries do not both begin with '\n'
msgfmt: found 7 fatal errors
gettext: locale/po/zh_HANS.po: can't guess language
gettext: locale/po/zh_HANT.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.