I think I'm done with international support for Slax now. I managed to put there a cool feature, it's a new one for me so I'm happy I was lucky enough to notice it: thanks to xdg-user-dirs, it is possible to provide internationalized directory names such as "Downloads", "Photos", "Videos" and such, all in your language.
When Slax is started with international support (with a language module), it automatically creates the directories using system locales. It seems most of the software understands this, so for example Mozilla will start saving files to "Downloads" (its internationalized equivalent) and so on.
I enjoy watching Slax in Chinese and Russian now, it looks so exotic :)