UserStatusScreen: Add "Busy" option

Fixes: #5255

Author: chrisbobbe

src/user-statuses/UserStatusScreen.js

@@ -34,6 +34,7 @@ type StatusSuggestion = [
 ];
 
 const statusSuggestions: $ReadOnlyArray<StatusSuggestion> = [
+  ['working_on_it', 'Busy'],
   ['calendar', 'In a meeting'],
   ['bus', 'Commuting'],
   ['sick', 'Out sick'],

static/translations/messages_en.json

@@ -274,6 +274,7 @@
   "Couldn’t load information about {fullName}": "Couldn’t load information about {fullName}",
   "What’s your status?": "What’s your status?",
   "Click to join video call": "Click to join video call",
+  "Busy": "Busy",
   "In a meeting": "In a meeting",
   "Commuting": "Commuting",
   "Out sick": "Out sick",