Compile instructions:

1. Easy way

Get Qt (either http://trolltech.com/products/qt or your package manger under Linux), get Qdevelop (http://qdevelop.org), and MingW (http://www.mingw.org/) if you are on a windows box.
Follow QDevelop instructions to setup Qdevelop development environment. Open the project file (.pro) under QDevelop, and that's it.

2. Old-school way (aka. Command-line way)

2.1. Windows

- Get Qt (http://trolltech.com/products/qt) and MingW (http://www.mingw.org/).
- Setup your PATH environnement variable to point to MingW's "bin" directory, and to Qt's "bin" directory.
- In a prompt, navigate to the project root directory.
- Type "qmake -o Makefile".
- Type "mingw32-make".
- That's it, you should find the executable file under the "bin" directory.

2.2. Linux

- Get Qt, and maybe Qt's development libs/tools. I am not sure development libs are required, but you should at least have qmake.
- Get GNU compilation tools (gcc, g++ and their friends). On a Debian or Debian-like box, it should be something like "apt-get install build-essential".
- In a prompt, navigate to the project root directory.
- Type "qmake -o Makefile".
- Type "make".
- That's it, you should find the executable file under the "bin" directory.

2.3. MacOS

I don't have a clue.

3. Traduction

Traduction files are .ts files. They should be compiled with Qt's tool, "lrelease", before main build.