Updated manage_translations script

    RUNABLE_SCRIPTS = ('update_catalogs', 'lang_stats', 'fetch')

    parser = ArgumentParser()

    parser.add_argument('cmd', nargs=1)

    parser.add_argument('cmd', nargs=1, choices=RUNABLE_SCRIPTS)

    parser.add_argument("-r", "--resources", action='append',

        help="limit operation to the specified resources")

    parser.add_argument("-l", "--languages", action='append',

        help="limit operation to the specified languages")

    options = parser.parse_args()

    if options.cmd[0] in RUNABLE_SCRIPTS:

    eval(options.cmd[0])(options.resources, options.languages)

    else:

        print("Available commands are: %s" % ", ".join(RUNABLE_SCRIPTS))