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to do overrides language you can go to joomla backend > extensions manager > language manager > overrides > new
you must search the constant name you want to change on language / en-gb / en-GB.com_community.ini or on your italian languange folder just open XXX.com_community.ini..
find the constant like COM_COMMUNITY_XXX and add the constant into overrides field
add text for your translate on field below constant field on overrides page..
Click save..
as example :
find : COM_COMMUNITY_VIDEOS_FRIEND_PERMISSION_MESSAGE
add it into constant name field on overrides page
add this : You need to be %1$s's friends to watch this video.
on your text field below constant name field..
don't change the bold text or if there is a link like <a href=_QQQ_%1$s_QQQ_>%2$s</a>.. just translate the language :)
To modified top menu, you must change menu item name on menu item manager.. if you only used italian languange, you can change it directly from menu manager and search which menu you want to change :)