Typo in word "gender"

"è stato aggiunto" not "è stato aggiunta"
perhaps little typo

"Modifici" is not an Italian word, maybe "Modifica"
Grammar error

"quale ramo" is correct, "quale rame" is not
Command typo

`git co` is correct, `git ci` is not
Reset last commit

`git ci` was correct, instead of `git co`
Merge pull request #528 from Zorgatone/master

[IT] - Minor language grammar fixes