[PATCH] i18n: update italian translation

[Stefano Tortarolo]

Just some quick notes/questions...
1. Am I the only italian interested in such a translation? It would be
great if someone else could take a peek at this translation...

2. I'm not translating some words e.g., "changeset", "pull", "merge"
since these are quite common terms that don't seem to have an italian
version.

3. Martin, I'm adding you to cc:/to:... is it ok for you?

Cheers,
Stefano