Fix i18n test for Chinese translation
    
    Python 3's regular expression default to full range of unicode
    characters. Restrict \w matches to ASCII and drop \b suffix check to fix
    a problem with validation the Chinese translation zh_CN.
    
    Co-Authored-By: Stanislav Laznicka <slaznick@redhat.com>
    Signed-off-by: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Stanislav Laznicka <slaznick@redhat.com>