Add Italian translation

[platipo]

Adding draft, it needs to be reviewed.
Anyway I managed to translate all strings but 58 that I couldn't found a fitting expression so I let those blank.

See #1226.

[dhalbert]

Could you merge the latest and run make translate again? Build is failing with "message message ID".

[platipo]

I rebased the commit and run make check-translate and make translations, neither of them raised errors on my computer

[platipo]

It seemed that when I started the translation there was an extra line

#: ports/nrf/common-hal/busio/SPI.c:170
msgid "Baud rate too high for this SPI peripheral"
msgstr "Baudrate troppo alto per questa periferica SPI"

And the script detected only the difference between the two, wouldn't it be more informative to do just:

for trans in $(ls locale/*.po); do
    diff <(grep "^msgid" locale/circuitpython.pot) <(grep "^msgid" $trans)
done

[tannewt]

Great job translating all of these messages! Leaving some blank is fine. This is a great start.

Looks like the build is failing due to a missing line ending: https://travis-ci.org/adafruit/circuitpython/jobs/438210422#L711

I don't think the diff command will find all cases because msgids can wrap on multiple lines. The python script should be able to detect it though.

[platipo]

Fixed missing newlines and ready to merge.

Maybe the diff could improve by improving the regex, but I think that the check-translate script should me more informative because it's easy to miss one line in 500+ msgids

[tannewt]

Yay! Thank you!