Yes, but that nor Monolingual work on the updated versions. So when you'll update like from 10.3.1 to 10.3.2 the standard update adds all language packs to your system. At least in Jaguar it always did. And monolingual didn't get away that stuff, so I opened frustratedly all the programs and deleted the stuff i didnt need (all languages i didnt ever want to use).
When you install the OS, just choose CUSTOM installation, and decide which languages you want to use. That way there is no need to use those delocalisers.