Italian translation for plugin Image Buttons 1.4

I made an italian translation for the Image Buttons squirrelmail plugin, 
you can find it attached.

After some tests I also discovered that the .pot file (also used in the 
provided ro_RO translation) has an error, an added ending ":" in the 
"Cache Buttons locally" msgid, that was preventing match and translation.

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C.N.M.C.A.

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