Index: src/org/openstreetmap/josm/gui/dialogs/properties/PropertiesDialog.java
===================================================================
--- src/org/openstreetmap/josm/gui/dialogs/properties/PropertiesDialog.java	(revision 4280)
+++ src/org/openstreetmap/josm/gui/dialogs/properties/PropertiesDialog.java	(working copy)
@@ -267,7 +268,7 @@
                 values.getEditor().selectAll();
             }
         };
-        final JDialog dlg = optionPane.createDialog(Main.parent, tr("Change values?"));
+        final JDialog dlg = optionPane.createDialog(Main.parent, m.size() == 1 ? tr("Change value?") : tr("Change values?"));
         dlg.setModalityType(ModalityType.DOCUMENT_MODAL);
         Dimension dlgSize = dlg.getSize();
         if(dlgSize.width > Main.parent.getSize().width) {
@@ -447,7 +462,7 @@
                 keys.getEditor().selectAll();
             }
         };
-        JDialog dialog = pane.createDialog(Main.parent, tr("Change values?"));
+        JDialog dialog = pane.createDialog(Main.parent, tr("Add value?"));
         dialog.setModalityType(ModalityType.DOCUMENT_MODAL);
         dialog.setVisible(true);