Set correct 1.23 release date in Release Notes.

Language XML files: Update Arabic translation (contributed by Ali Kho…

…jah)

FreeBSD: make official FreeBSD build script executable

Merge pull request veracrypt#175 from robertsvensson/patch-1

Minor TOC correction

Update User Guide

Windows: Fix compilation error caused by latest MacOSX change.

Windows: Fix compilation error caused by latest MacOSX change.

Increment version to 1.18. Update user guide PDF file.

MacOSX: increment bundle version to 1.17.22

Increment version to 1.16. Update user guide PDF file.