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You probably used old roundup.pot when regenerating lt.po,
as there is no fuzzy in my lt.po and lt.po in cvs misses 3
new translations, which are in my lt.po. I did the following:
msgmerge --no-wrap lt.po roundup.pot > lt.1.po
msgmerge --no-wrap lt_cvs.po roundup.pot > lt.2.po
diff -u lt.1.po lt.2.po