[TASK] Output log should be shown as HTML

Change-Id: I4b80d10488d946a3a775c8199483788467fd4b8b
Resolves: #60890
Reviewed-on: http://review.typo3.org/32088
Reviewed-by: Xavier Perseguers <xavier@typo3.org>
Tested-by: Xavier Perseguers <xavier@typo3.org>