Plug Update official firmware on galaxy tab t320 (for chg language in italian)

I have the galaxy tab pro t320 (8.4") us language.
I would like to install, for the change the language in Italian, the official firmware Galaxy Tab PRO 8.4 SM-T320 EUR T320XXU1ANAI (Android 4.4.2 30.01.2014 NA26R1) found in the site
techcrot.info/download-official-firmware-galaxy-tab-pro-8-4-sm-t320.
These are my questions:
1) This site has really official rom (i don't fount it in the samsumg site)
2) Is true that I can set the Italian language, with this rom (in the rom stock in the device are only English, French, Spanish)
3) The procedure void my warranty??

Thanks