Update IT translation

Updated Italian translation updating ART message and reset preferences
strings

PS2: Clean up tabs and whitespaces, updated led translations.
PS3: Ups some whitespaces survived the war.
PS4: Fix missing "\" symbol and update led strings from recent merge.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>
Change-Id: Iec2ca99b6ad7ef3543893892c980385f5edf1783