deploy-20200412

Deploy for 2020-04-12

* Fix inbox flag calculation task (#497)
* Fix session extending code (#489)
* Users who have not logged after a certain amount of time will have their personal data removed from Inboxen (#444, #504, #505)
* Switched scheduled tasks to a cron-style schedule (#502)
* Stop using old MiddlewareMixin (#507)
* Disabled Swedish translations now
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