[BUGFIX] Use proper implementation of a wordwrap

The page module uses a custom implementation of a wordwrap
as this was not supported by the browser in those earlier days.

The big drawback is that there is no UTF8 support for this which
leads to empty preview boxes when e.g. using Japanese.

Change-Id: I7caab8e14a9a0b7ccbd38c692b0cf98635967567
Resolves: #15797
Releases: 6.2, 6.1
Reviewed-on: https://review.typo3.org/22840
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters
Reviewed-by: Christian Kuhn
Tested-by: Christian Kuhn