Lars helped fix the check that variable in non-en_US messages are also in the corresponding en_US message. Replacing old get_missing_embedded_vars proc with the new get_embedded_vars proc and adding a bunch of test cases
cleanup and renaming of import/export procs in lang::catalog namespace. Now there are really only two public procs to know about: lang::catalog::import and lang::catalog::export. Updating all invocations of the procs and test cases. Adding proc lang::message::unregister for deleting message keys - used in test case teardown.