Michal Čihař - Demo server updates

Demo server updates

Today I finally made something for phpMyAdmin :-). First I've updated Czech translation of 3.0, so it is not that behind as it used to be (only some PBXT strings are missing right now) and then I fixed some potential issues which Thijs has found (thanks to him for his great security work not only for Debian).

Later I focused a bit on demo server. As we already have new setup script from GSoC (made by Piotr Przybylski), links to setup script have been updated and I also reorganised links to all demo versions including direct login links for cookie based authentication. I hope it is now a bit easier to navigate and choose which demo version you want to test :-).