add --previous at bubulle's suggestion

diff --git a/IkiWiki/Plugin/po.pm b/IkiWiki/Plugin/po.pm
index 193cf0a543a24f05c5221eb1b8557d83ba38e98e..8f169fda59dff443e1189f49af52453d5fd7c641 100644 (file)
--- a/IkiWiki/Plugin/po.pm
+++ b/IkiWiki/Plugin/po.pm
@@ -828,7 +828,7 @@ sub refreshpofiles ($@) {
        foreach my $pofile (@pofiles) {
                IkiWiki::prep_writefile(basename($pofile),dirname($pofile));
                if (-e $pofile) {
-                       system("msgmerge", "-q", "-U", "--backup=none", $pofile, $potfile) == 0
+                       system("msgmerge", "--previous", "-q", "-U", "--backup=none", $pofile, $potfile) == 0
                                or error("po(refreshpofiles) ".
                                         sprintf(gettext("failed to update %s"),
                                                 $pofile));