pfSense

Add Kea info to status.php. Implements #14953

While here, change ISC DHCP info header to include "ISC" and only
include those sections if the config files exist.

qinq: remove incorrect config access

Improve Setup Wizard error handling. Fixes #15302

While here, clean up some misc PHP syntax I spotted along the way.

Also made sure all error messages are wrapped in gettext()

Fixup wizard pw to reduce diff against issue #15266

Fix setup wizard WAN form field name. Fixes #15301

Update setup wizard WAN JavaScript. Fixes #15301

Update old fontawesome class reference

Add loader.conf.lua to status.php. Implements #15298

Add EFI boot info to status.php. Implements #15297

Remove unnecessary treegrid files. Implements #15265