Index: applications/editors/josm/i18n/convpreset.pl
===================================================================
--- applications/editors/josm/i18n/convpreset.pl	(revision 29207)
+++ applications/editors/josm/i18n/convpreset.pl	(revision 29208)
@@ -193,4 +193,5 @@
   {
     print "/* unparsed line $line */\n";
+    print STDERR "/* unparsed line $line */\n";
     $result = 20
   }
@@ -202,3 +203,3 @@
 
 print "}}\n";
-return $result if $result;
+exit($result) if $result;