For one, install:module was missing from xcu files that are processed with
gb_Configuration_add_spool_modules, resulting in effectively empty output
xcu files.  For another, localization from Addons.xcu is now merged into
per-lang registry_*.xcd in postprocess/packregistry/makefile.mk.

Change-Id: Ie87edbad163b124d18090ab36aa36de560a20cbc