Remove "Canada/East-Saskatchewan" time zone, which was removed from the IANA database in release 2017c of the database.
From
>
> Remove Canada/East-Saskatchewan from the 'backward' file, as it
> exceeded the 14-character limit and was an unused misnomer anyway.
>
@@ -419,7 +419,6 @@ angular.module('form').controller('timeZoneFieldController', ['$scope', '$inject
"Canada" : {
"Atlantic" : "Canada/Atlantic",
"Central" : "Canada/Central",
- "East-Saskatchewan" : "Canada/East-Saskatchewan",
"Eastern" : "Canada/Eastern",
"Mountain" : "Canada/Mountain",
"Newfoundland" : "Canada/Newfoundland",
