Bug 966694 - [Australis] Quit button in AppMenu footer has no tooltip on Windows, r=gijs

browser/components/customizableui/content/panelUI.inc.xul

@@ -37,6 +37,7 @@
           <toolbarbutton id="PanelUI-quit"
 #ifdef XP_WIN
                          label="&quitApplicationCmdWin.label;"
+                         tooltiptext="&quitApplicationCmdWin.tooltip;"
 #else
 #ifdef XP_MACOSX
                          label="&quitApplicationCmdMac.label;"

browser/locales/en-US/chrome/browser/browser.dtd

@@ -570,6 +570,7 @@ you can use these alternative items. Otherwise, their values should be empty.  -
 
 <!ENTITY quitApplicationCmdWin.label       "Exit"> 
 <!ENTITY quitApplicationCmdWin.accesskey   "x">
+<!ENTITY quitApplicationCmdWin.tooltip     "Exit &brandShortName;">
 <!ENTITY goBackCmd.commandKey "[">
 <!ENTITY goForwardCmd.commandKey "]">
 <!ENTITY quitApplicationCmd.label       "Quit">