Prepare for release.
Updated file list to add new CONTRIBUTING.md.
Updated translation files, thanks to all translators.
Add missing directories to build script, they were created by otrs.SetPermissions.pl previously.
Fixed wrong hash access on array ref.
Show unread star also in timeline view and mark articles as read when clicking the star or the magnifier icon.
Fixed JS errors and IE issues.
Improved short text display in timeline view.