Bug 1534447 - Add new string for application menu item to access Logins/Passwords. r=flod,Gijs

Differential Revision: https://phabricator.services.mozilla.com/D23216

--HG--
extra : moz-landing-system : lando

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

@@ -408,6 +408,7 @@ These should match what Safari and other Apple applications use on OS X Lion. --
 <!ENTITY preferencesCmd2.accesskey     "O">
 <!ENTITY preferencesCmdUnix.label       "Preferences">
 <!ENTITY preferencesCmdUnix.accesskey     "n">
+<!ENTITY logins.label                           "Logins and Passwords">
 
 <!ENTITY clearRecentHistory.label               "Clear Recent History…">