Terminals.

[Abion47]

It sounds like you've already done most of it, so all that's left is to call ImGui_SetTransCategory at the beginning of your terminal's OnGui function. Make sure that you have #include "helpers/helper_imgui.hps" at the top of your map script. If it still doesn't work, try replacing the spaces in your lang file categories with underscores (none of the SOMA lang files have spaces in the category names, so maybe spaces aren't supported).