Hi, BH.
1. in the "Data\Menu" there is a menu.txt.
2. in "Data\UPCData\UPCUnitsData", there are files named as "UnitPartsXXXX.upc" and an "Equipment.upc".
3. in "Data\UPCData\UPCLocalization" there is a "UPCLocalization.tsr".
Use text-editing software to replace all "night periscope" with "observation periscope", it will do.
(I test it in FotRSU but it should be the same in TMO
)