pfSense

Fix #7452 save new IPv6 gateway

This is also needed, just like for IPv4 in commit https://github.com/pfsense/pfsense/commit/f3278171b199062279225631903685e608285d3a

Revise dev_mode change handler

Fixed #7451
Revised onchage handlers to obviate need for second click in Chrome on MacOS

Properly hide TLS Key / TLS Type fields when changing to Shared Key mode for OpenVPN clients.

Update translation files

Regenerate pot

CSRF: Close session before exit

On CSRF, call phpsession_end() before exit to avoid syslog warning
about open session

Submitted by: PiBa-NL

Restore CSRF customizations

Update CSRF to latest version from github

Fix UTF8 in base64 decode