Fix config issue. Recursive form generation (not processing). Spanish translation

Hi there,
Thanks for this nice bundle, you've saved me a while...
I'd like you to consider a few modifications:

- I've had an issue configuring the paths, since you where injecting and prepending 'kernelroot' in Configurator, at the same time that you prependend the same in the config.yml doc sample (leading to double prepending.. and error). I think that for the sake of flexibility is better to remove it from Configurator, relying just in whatever config.yml says.

- I've also added support for n-level form generation... but so far I couldn't manage to also add support for n-level form processing (in Configurator::mergeParameters). Though, I think it's in the right line.

- Spanish translations.

Regards and thanks again.

Javier.