[pve-devel] translation updates

[Thomas Lamprecht]

Note that I splitted the italian translation updates for a good reason.
The first batch is a fixup from my last update which was provided by Marco
Menardi (thanks again!) and the second batch are new translations which weren't
yet reviewed by another native speaker - thus I wanted to split revied and non
revied to make the work easier and smaller for an possible reviewer
Most new stuff should be too bad, I hope :)

cheers,
Thomas