[TASK] Improve wording in Install Tool Wizard

* Wrap filename of 'FIRST_INSTALL' into code instead of strong tag
* Move info text about secure password to the password field

Resolves: #90720
Releases: master
Change-Id: I4c275bfbb11f401cc982efcb815397b472ea9b1b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63651


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Christian Eßl <indy.essl@gmail.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Benni Mack <benni@typo3.org>