async support for S2 combobox

Author: LFDanLu

packages/@react-spectrum/s2/intl/en-US.json

@@ -5,6 +5,7 @@
   "actionbar.actions": "Actions",
   "actionbar.actionsAvailable": "Actions available.",
   "button.pending": "pending",
+  "combobox.noResults": "No results",
   "contextualhelp.info": "Information",
   "contextualhelp.help": "Help",
   "dialog.dismiss": "Dismiss",
@@ -30,4 +31,4 @@
   "tag.actions": "Actions",
   "tag.noTags": "None",
   "breadcrumbs.more": "More items"
-}
+}