Index: applications/editors/josm/plugins/buildings_tools/src/buildings_tools/MergeAddrPointsAction.java
===================================================================
--- applications/editors/josm/plugins/buildings_tools/src/buildings_tools/MergeAddrPointsAction.java	(revision 31099)
+++ applications/editors/josm/plugins/buildings_tools/src/buildings_tools/MergeAddrPointsAction.java	(revision 31100)
@@ -3,4 +3,5 @@
 
 import static org.openstreetmap.josm.tools.I18n.tr;
+import static org.openstreetmap.josm.tools.I18n.trn;
 
 import java.awt.event.ActionEvent;
@@ -131,8 +132,8 @@
         }
         if (multi != 0)
-            new Notification(tr("There are {0} buildings with multiple address nodes inside", multi))
+            new Notification(trn("There is {0} building with multiple address nodes inside", "There are {0} buildings with multiple address nodes inside", multi, multi))
                     .setIcon(JOptionPane.WARNING_MESSAGE).show();
         if (conflicts != 0)
-            new Notification(tr("There are {0} buildings with address conflicts", conflicts))
+            new Notification(trn("There is {0} building with address conflicts", "There are {0} buildings with address conflicts", conflicts, conflicts))
                     .setIcon(JOptionPane.WARNING_MESSAGE).show();
         if (cmds.isEmpty() && multi == 0 && conflicts == 0)