> -*/*/af/*/*/  
> -*/*/ar/*/*/  
> ...
> -*/*/zh-yue/*/*/  
> -*/*/zh/*/*/ 

If you're doing that you not think correctly. Instead you want to reject
everything except English.

-* +wikitravel.org/en/*

Also the robots.txt states:
Disallow: /en/wiki/
So you'll have to override robots.