fix Bugzilla Bug 63103 add "About Plug-ins" to the Help menu

by bzbarsky@mit.edu r=timeless, a=ben

suite/common/utilityOverlay.xul

@@ -134,6 +134,8 @@
 			<menuitem accesskey="&releaseCmd.accesskey;" value="&releaseCmd.label;"
 			          id="releaseUrl" oncommand="openTopWin('&releaseURL;');"/>
 			<menuseparator/>
+                        <menuitem class="about" accesskey="&aboutCommPluginsCmd.accesskey;" value="&aboutCommPluginsCmd.label;"
+                                id="pluginInfo" oncommand="openTopWin('about:plugins')"/>
 			<menuitem accesskey="&aboutCmd.accesskey;" value="&aboutCmd.label;"
 			          id="aboutName" oncommand="goAboutDialog();"/>
 		</menupopup>

suite/locales/en-US/chrome/common/utilityOverlay.dtd

@@ -91,3 +91,5 @@
 <!ENTITY releaseCmd.accesskey				"r">
 <!ENTITY aboutCmd.label					"About &brandShortName;">
 <!ENTITY aboutCmd.accesskey				"a">
+<!ENTITY aboutCommPluginsCmd.label			"About Plug-ins">
+<!ENTITY aboutCommPluginsCmd.accesskey			"p">