FOSS gamedev and creative worlds

Okay, so this is probably a noob question, but anyways.... In the configuration section of the GUI where it shows the mod's depends, there's question marks after the ones I don't have or something like that. But what's the intllib? A lot of mods seem to require that, yet I don't know how to access/get it.

The question mark indicates that the dependency is optional. intllib is a mod to allow for internationalization and is available here https://forum.minetest.net/viewtopic.php?id=4929