Wanting to speed up gameplay, I fetched a copy of all of these pages to my laptop's /var/www/htdocs/d8b7ddd7/mainPage/*, duplicating all of the relevant subdirectories and putting each document where it was expected, and then modified my /etc/hosts to point gpack.travian.com to localhost instead of the travian server.
When I pointed my browser at compact.css it fetched the locally cached document as expected, but when I refreshed my travian game page the CSS failed to load (the page was unformatted). I removed the /etc/hosts entry and everything went back to normal (but still slow).
Does anyone have suggestions as to what might be going on here, or if there is a better way to cache these files? I googled around and found there are downloadable "language packs", but those are Windows-specific and I am running Linux.