def METHOD_NAME(lang, in_dir, new_dir):
    # fn_en   - StringResource_en_US.xml
    # fn_lang - StringResource_de.xml - translated strings from zanata
    # fn_new  - StringResource_de.xml.new - newly created file using fn_en
    #           as a template with translated strings added from fn_lang
    fn_lang = "%s/StringResource_%s.xml" % (in_dir, lang)
    if not os.path.isfile(fn_lang):
      print "No file %s - exiting..." % fn_lang
      return
    fn_en   = "%s/StringResource_en_US.xml" % in_dir
    fn_new  = "%s/StringResource_%s.xml.new" % (new_dir, lang)
    print "EN vs. %s:"  % lang
    outstr = process_one_lang_file(lang, fn_en, fn_lang)
    write_new_file(fn_new, outstr)