Translations: Update the Italian man page translations

Only trivial additions but this keeps the file in sync with the TP.

po4a/it.po

@@ -1960,7 +1960,7 @@ msgstr "ARM"
 #: ../src/xz/xz.1
 #, no-wrap
 msgid "ARM-Thumb"
-msgstr ""
+msgstr "ARM-Thumb"
 
 #. type: tbl table
 #: ../src/xz/xz.1
@@ -2002,7 +2002,7 @@ msgstr "16"
 #: ../src/xz/xz.1
 #, no-wrap
 msgid "Itanium"
-msgstr ""
+msgstr "Itanium"
 
 #. type: tbl table
 #: ../src/xz/xz.1