Add translations for Notification drawer like Trello.

i18n/en.i18n.json

@@ -763,6 +763,10 @@
   "new": "New",
   "editUserPopup-title": "Edit User",
   "newUserPopup-title": "New User",
+  "notifications": "Notifications",
+  "view-all": "View All",
+  "filter-by-unread": "Filter by Unread",
+  "mark-all-as-read": "Mark all as read",
   "allow-rename": "Allow Rename",
   "allowRenamePopup-title": "Allow Rename"
 }