imho those two italian traslation are inverted:

-----------------------
msgid "Adaptor is offline"
msgstr "Adattatore connesso"
#: ../src/xfpm-power.c:1163 ../src/xfpm-power.c:1168 ../src/xfpm-battery.c:404
#, c-format
msgid "Adaptor is online"
msgstr "Adattatore non connesso"
#: ../src/xfpm-power.c:1621 ../src/xfpm-power.c:1642 ../src/xfpm-power.c:1657
#: ../src/xfpm-power.c:1680
------------------------

if "Adaptor is offline", i think, for example in a notebook, that "Adaptor" is the external power supply, this translation must be "Adattatore non connesso".

or maybe i misunderstood something

Cipo