[BUGFIX] Properly encode text in JS in install tool

Several times the install tool was using html()
instead of text(). Use text() whenever possible.

Resolves: #82949
Releases: master
Change-Id: I9a199d33f233a3b6c6b82965d4bc169999a3452a
Reviewed-on: https://review.typo3.org/54586


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Michael Oehlhof <typo3@oehlhof.de>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>