Index: trunk/data/validator/wikipedia.mapcss
===================================================================
--- trunk/data/validator/wikipedia.mapcss	(revision 12215)
+++ trunk/data/validator/wikipedia.mapcss	(revision 12415)
@@ -140,5 +140,5 @@
 /* Wikipedia without wikidata */
 *[!wikipedia][/^wikipedia:/] {
-  throwWarning: tr("wikipedia tag is not set, but a ''{0}'' tag is. Make sure to use wikipedia=language:value together with wikidata tag.", "{0.key}");
+  throwWarning: tr("wikipedia tag is not set, but a ''{0}'' tag is. Make sure to use wikipedia=language:value together with wikidata tag.", "{1.key}");
   assertMatch: "node wikipedia:en=a";
   assertNoMatch: "node wikipedia=a wikipedia:en=b";