Hello viandar, welcome to the .Org and to EB.
The short answer is that you are editing the wrong export_descr_unit.txt (EDU) file: you need to edit the one in a folder called "sp campaign game edu" (I think), not the one in "Data". EB includes 2 EDU files: one for the campaign, and a shorter one for multiplayer/custom battles. This is because the campaign EDU contains so many units that the unit selection screen for MP/custom battles gets overwhelmed. At the start of the game, the Trivial Script will overwrite the EDU in the "Data" folder with the one from "sp campaign game edu" or "mp custom game edu".
I hope this has answered your question.
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