Assuming you're running Windows, the game doesn't mess with the registry (apart from linking uninstallers to Uninstall.exe), so I'd say it's already portable. You could use 7zip to package the game, then have it run assaultcube.bat after extraction.
Or you can download it from here: http://portableapps.com/apps/games/assaultcube_portable
With the upcoming 1.2.0.0 release, you can change those kill texts in /config/serverkillmessages.cfg, but with 1.1.0.4 you'll need to edit it in entity.h and recompile the client. :/
Or you can download it from here: http://portableapps.com/apps/games/assaultcube_portable
With the upcoming 1.2.0.0 release, you can change those kill texts in /config/serverkillmessages.cfg, but with 1.1.0.4 you'll need to edit it in entity.h and recompile the client. :/