Remove the locale tag from zanata.xml
    
    This prevents error messages like:
    [!] Locale mappings are now handled using locale aliases on the server, so locale mappings in the project config file (zanata.xml) are now deprecated.
    Please add a locale alias in the project language settings to replace each locale mapping in zanata.xml, then remove the <locales> section from zanata.xml
    
    See also:
        http://docs.zanata.org/en/release/client/configuration/
    
    Reviewed-by: N/A