fix it translation

git-svn-id: svn+ssh://svn.savannah.nongnu.org/linphone/trunk@657 3f6dc0c8-ddfe-455d-9043-3cd528dc4637

linphone/po/it.po

@@ -494,7 +494,7 @@ msgstr "Vista principale"
 
 #: ../gtk-glade/main.glade.h:38
 msgid "Mute"
-msgstr ""
+msgstr "Chiudi microfono"
 
 #: ../gtk-glade/main.glade.h:39
 msgid "My current identity:"