Give informations for Anonymous reporting in Global settings

[baudelotphilippe]

Maybe it would a good idea to explain what, when, and so on here (like the content displayed during the first connection)

[helakaraa]

Home/Setting: Display a message stating: "This feature allow Izanami to send us periodical reports. It won't send sensitive or personnal data, only a set of usage statistics related to Izanami {see details of the data sent below} {..}" between the Anonymous reporting label and the toggle button.