pfSense

Consistent use of System Update

In some places it said "System update" and in others "System Update" - be consistent.
The confirm button called it "Upgrade". Make that consistent with the existing use of the term "Update" for system updates.

Note: Packages are still said to be "upgraded" rather than "updated" - there are places where headings, confirm prompts etc will say "Upgrade package"....

More gettext~ing

Added gettext() around alert string

Fixed #5566

Don't validate 'external' when nobinat is checked

Revise tooltip

Fix no binat checkbox

Fix help

Fixed #3887

Remove duplicate "Are you sure you want to" on delete