Correct bash-specific syntax in startup script - fixes #7450

This patch reverts a bash-specific syntax to Bourne-shell syntax
to fix a fail-to-start problem in Solaris 10.

fixes #7450
Fix grammatical errors in popup text - fixes #7451

This fixes a group of grammatical errors that I noticed this morning,
e.g. "Event handling for this host have been disabled".  It should,
and now does, read, "Event handling for this host has been disabled".

fixes #7451
Merge remote-tracking branch 'origin/fix/bash-specific-usage-breaks-solaris-7450' into next

fixes #7450
Merge remote-tracking branch 'origin/fix/grammatical-errors-in-CGIs-7451' into next

fixes #7451
Update Changelog

refs #7451
refs #7450