Using f:format.html in the backend context must be avoided
and is deprecated now.

Change-Id: I734593bdde1e43339131a6e7f93f9c29c52dd470
Resolves: #72716
Releases: master
Reviewed-on: https://review.typo3.org/45913


Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>