o is_install_media() was being misused.  In the instance of dhcp6,
  the backup file did not even exist, I think someone did copy+paste
  the IPv4 code back in the day and the actual backup was never added.

o match_wireless_interface() was moved to interfaces.inc where it
  belongs.

OpenVPN Client Export: add CA chain to CA certificates

While there, move some stray menu items to their respective module
menu and minimise the padding of the menu to reclaim the space added
by the fixed-width icon behaviour.

Looking good!  :)

Suggested by: @8191

CA Generation: fix internal intermediate CA creation

Internal intermediate CAs were not correctly refered back to the signing CA.

Menu: fixed menu for IPsec Mobile Clients after apply

The style checking is done in the build system, so there's no need
to keep this here.  A more dynamic way needs to be devised at some
point that allows plugging PHP modules into the code, but it's not
overly important.

Suggested by: @fabianfrz

Taken from: https://translate.opnsense.org/

Fix from @DokuKaefer

fix by @8191

OpenVPN wizard: remove incorrect legacy text

(legacy, ipsec) vpn_ipsec.php replace glyphicon glyphicon-remove with fa fa-trash text-muted (again, original in https://github.com/opnsense/core/commit/87014246c03c1697cd1836c973435bd85f8e9b80)