Add logging information about who starts which export

Description

We should log who is starting an export.
Something like 'User xxx started exporting page xxx with template xxx', at least as DEBUG logging.

Right now, if an export produces no warnings, an export can be completely unnoticed in the logs - even in DEBUG mode the username is not printed out.

Environment

None

Status

Assignee

Unassigned

Reporter

Peter Bastian (K15t)

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Fix versions

Priority

Major
Configure