[BUGFIX] Force word breaks in callouts

The CSS of callouts is adjusted to enforce word breaks to prevent
overlapping the container.

Resolves: #86827
Releases: master
Change-Id: I91be87f22b3f3192f594f028575dfb9f36191b81
Reviewed-on: https://review.typo3.org/58820


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Steffen Dietrich <Teilzeitphilosoph@gmx.de>
Tested-by: Steffen Dietrich <Teilzeitphilosoph@gmx.de>
Reviewed-by: Jonas Eberle <flightvision@googlemail.com>
Tested-by: Jonas Eberle <flightvision@googlemail.com>
Reviewed-by: Anja Leichsenring <aleichsenring@ab-softlab.de>
Tested-by: Anja Leichsenring <aleichsenring@ab-softlab.de>