I've had a wee rummage around to see if anyone else has come across the same problem with AC8.1.1's Translator menu. (I can't get the update to 8.1.2 to work btw)
When I use the Translator menu/dialogue I sometimes find that even although I've added new items the menu displays the same item again and again rather than what I have typed in. I have to close the menu/dialogue box and open it again but usually it starts doing it again.
My workaround was to edit the DXF-DWG Translator XML file directly with BBedit. Which leads me onto one thing to watch when you edit the file this way is that you need to count how many layers you have added to the list of layers to be renamed.
For example
</LayerMethods>
<LayerConvTab>
<LayerConv items="34">
<Item ACLayer="S-0-MISC" ACADLayer="LAYER1">
</Item>
........ etc
The bold highlighted number above has to be altered to match the total number of layers that are added to the list. Otherwise when the translator file is used by ArchiCAD it will only process in this the first 34 layers if you have more than that then the 35th layer and greater will be ignored.
AC versions 3.41 to 25 (UKI Full 5005).
Using AC25 5005 UKI FULL
Mac OSX 10.15.7 (19G2021) Mac Pro-2013 32gbRam AMD FirePro D500 3072 MB graphics