add Italian translation to the Website

@Luca91 https://forum.f-droid.org/t/translating-website-in-italian

client app 100% translated
About and Contribute pages in website docs 100% translated
10 apps in fdroiddata 100% translated
"chrome" strings 100% translated

Edited Jul 04, 2017 by Licaon_Kter

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information