Bug 983583 - define missing PREF_SELECTED_LOCALE for Australis menu panel, f=aryx, rs=me

browser/components/customizableui/content/panelUI.js

@@ -460,6 +460,7 @@ const PanelUI = {
  * @return  the selected locale or "en-US" if none is selected
  */
 function getLocale() {
+  const PREF_SELECTED_LOCALE = "general.useragent.locale";
   try {
     let locale = Services.prefs.getComplexValue(PREF_SELECTED_LOCALE,
                                                 Ci.nsIPrefLocalizedString);