[TASK] Replace JavaScript confirm dialog in User settings

This patch replaces the old JavaScript confirm dialog in user settings
module, which was used on the button "Reset Configuration and
Clear Temporary Data".

Resolves: #73600
Releases: master, 7.6
Change-Id: I24f872c5828aebfa08b2936e64abf57713182fbc
Reviewed-on: https://review.typo3.org/46810


Reviewed-by: Daniel Goerz <ervaude@gmail.com>
Tested-by: Daniel Goerz <ervaude@gmail.com>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>