Erik Arvstedt fcdcf62c2c Fix runtime warning when adding log entries
LogEntry.action_time expects a Django timezone object instead of a builtin datetime.

This fixes a runtime warning of the following kind:
RuntimeWarning: DateTimeField LogEntry.action_time received a naive datetime (2018-03-28 20:53:01.714173) while time zone support is active.
2018-03-30 00:15:52 +02:00
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