Internationalized web interface

Thanks to the recent work of Neubot contributor Alessio Palmero Aprosio and me, now it's possible to internationalize the messages of Neubot Web User Interface. See for example the following screenshot, with many messages translated into Italian:

i18n web interface

The text in the green stripe is not translated because that is an image. Alessio and I will deal with that in future. For now the internationalization effort will focus on translating most of the web user interface text into Italian. And I guess that Claudio Artusio, the great guy that translated most of this site, would be of much help to achieve this task too.