Fixed some misspellings in Italian Translation
Update Italian translation
cs_seen: fix for translations being ignored
These strings: " but %s mysteriously dematerialized.", ". %s is still online." and ", but %s mysteriously dematerialized." weren't translated by the method Anope::printf().
Update for Italian translation
Update for the old Italian translation of Anope, with new translated strings, correction of grammatical errors and other minor changes.