update EN start in tray setting wording

_locales/en/messages.json

@@ -335,8 +335,8 @@
   "onlyAdminCanRemoveMembersDesc": "Only the creator of the group can remove users",
   "createAccount": "Create account",
   "signIn": "Sign In",
-  "startInTrayTitle": "Start in Tray",
-  "startInTrayDescription": "Start Session as a minified app ",
+  "startInTrayTitle": "Keep in System Tray",
+  "startInTrayDescription": "Session continues running in the background when you close the window",
   "yourUniqueSessionID": "Say hello to your Session ID",
   "allUsersAreRandomly...": "Your Session ID is the unique address people can use to contact you on Session. With no connection to your real identity, your Session ID is totally anonymous and private by design.",
   "getStarted": "Get started",