adding message catalog upgrade support to the acs-lang package. message keys and messages now have an upgrade status (added, deleted, updated). Being more rigorous about determining what is a catalog file and moving this logic to the acs-bootstrap-installer package (apm_is_catalog_file) as it is needed before the acs-lang library is loaded. Updated procedure documentation.
I18N: loading the catalog files from the lookup proc now if this hasn't already been done. The reason is that there are message lookups that happen before the acs-lang library files are loaded. The alternative would be to put the loading in a file with a path like acs-boostrap-installer/00-...