What could be a bit improved: the online help but the support is great...
It took me a while to find how to install the plugin (which let you customize the text,...).
For those who are still looking for it, there is nothing to download: it is installed from the aicontactsafe (Go to Component->aicontactsafe->Control Panel and click on the install button for aiContactSafeForm - which is at the bottom of the form -).
For those looking for a solution for multiple languages, I have used the FaLang component.
Everything works well in Joomla 2.5 .
Thank you very much for you amazing work!