po: add proper Language: tags to .po files

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff --git a/po/it.po b/po/it.po
index 592d3d8..a62665c 100644
--- a/po/it.po
+++ b/po/it.po
@@ -10,7 +10,7 @@
 "PO-Revision-Date: 2012-02-27 08:23+0100\n"
 "Last-Translator: Paolo Bonzini <pbonzini@redhat.com>\n"
 "Language-Team: Italian <it@li.org>\n"
-"Language: \n"
+"Language: it\n"
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"