--- a/calendar/chrome/lightning/lightning-toolbar.dtd
+++ b/calendar/chrome/lightning/lightning-toolbar.dtd
@@ -29,8 +29,12 @@
 <!ENTITY lightning.toolbar.day.label		"日表示">
 <!ENTITY lightning.toolbar.day.accesskey	"D">
 <!ENTITY lightning.toolbar.week.label		"週表示">
 <!ENTITY lightning.toolbar.week.accesskey	"W">
 <!ENTITY lightning.toolbar.multiweek.label	"多週表示">
 <!ENTITY lightning.toolbar.multiweek.accesskey	"u">
 <!ENTITY lightning.toolbar.month.label		"月表示">
 <!ENTITY lightning.toolbar.month.accesskey	"M">
+<!-- LOCALIZATION NOTE: the same as appmenuButton.label and appmenuButton.tooltip
+     from messenger.dtd -->
+<!ENTITY lightning.toolbar.appmenuButton.label	"アプリメニュー">
+<!ENTITY lightning.toolbar.appmenuButton.tooltip	"アプリケーションのメニューを表示します">