Re-add .tx/config

This reverts commit 81a8a03. While .tx can certainly be generated by
infra jobs on the fly, this helps people that want to work on
translations with (local) tools instead of Transifex web-interface.

Change-Id: I77ed05e929cc7500ab4ab9a46e96eb6e1384e7a7
Included new section to 'Create and manage roles' in Admin User Guide

New section to the Admin User guide to 'Create and manage roles'
in the dashboard chapter.
Partial-Bug: #1279133

Change-Id: Icb3667a6a83d37a84f649d1e01171a3f569a4f2d
Imported Translations from Transifex

Change-Id: I7345d47fe7260d26680a8d195b9caeede3b37b51
Merge "Included new section to 'Create and manage roles' in Admin User Guide"
Merge "Re-add .tx/config"