"new" i18n-gen.sh for 2.0

I updated the i18n-Script from `master` to work with the new project structure from `2.0`.

On another note I found this: http://wiki.maemo.org/Internationalize_a_Python_application#Python_way which proposes not to save the generated mo-files and instead automatically build them whenever the project is being built using a customization of `setup.py`.
Is this wanted?