Structures and dimensions don't have localized names by default.
If you see something like structure.<modid>.<name> in the GUI or HUD, that essentially means there is not localized name for it.
If you would like to add translations,
create corresponding JSON files under resources/assets/<modid>/lang/ and send Pull Requests to us.
We've put zh_cn translations of structures and dimensions in vanilla Minecraft there as a template,
and your translations should also follow the same style.
{
"dimension.minecraft.overworld": "Overworld",
"structure.minecraft.bastion_remnant": "Bastion Remnant"
}