Update runtime files.

Includes changing &sw to shiftwidth() for all indent scripts.
diff --git a/src/po/it.po b/src/po/it.po
index 2190047..e348ba7 100644
--- a/src/po/it.po
+++ b/src/po/it.po
@@ -11,7 +11,7 @@
 #
 msgid ""
 msgstr ""
-"Project-Id-Version: vim 7.4\n"
+"Project-Id-Version: vim 8.0\n"
 "Report-Msgid-Bugs-To: \n"
 "POT-Creation-Date: 2017-05-28 10:54+0200\n"
 "PO-Revision-Date:  2017-05-28 23:45+0200\n"