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 lammps 's PO files:

gettext: examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:1: keyword "VOTCA" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:1:1: syntax error
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:2: keyword "N" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:4: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:5: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:6: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:7: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:8: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:9: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:10: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:11: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:12: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:13: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:14: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:15: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:16: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:17: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:18: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:19: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpd_tstat/cg_spce_table.pot:20: keyword "E" unknown
msgfmt: too many errors, aborting
gettext: examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:1: keyword "VOTCA" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:1:1: syntax error
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:2: keyword "N" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:4: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:5: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:6: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:7: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:8: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:9: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:10: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:11: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:12: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:13: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:14: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:15: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:16: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:17: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:18: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:19: keyword "E" unknown
examples/PACKAGES/dpd-basic/dpdext_tstat/cg_spce_table.pot:20: keyword "E" unknown
msgfmt: too many errors, aborting
      

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.