I haven't downloaded your updated version, but your last version, at least, was missing a lot of the text updates and such from G16...
(I ended up updating them myself... ^^;)
However, here's what I noticed when looking over interface.english.txt:
These two lines control the text for the equipment tabs:
pli_windowhinventory.19 Gear
pli_windowhinventory.20 Decorative
By default, they're short enough to not need editing to avoid scrolling tabs. However, these two lines:
pli_windowopponentinventory.3 Equipment
pli_windowopponentinventory.4 Dress Uniform
They're used for viewing someone else's equipment, and they're too long so they cause the tabs to scroll. When I used your first version for 109, it was using these names for some reason for my own inventory. After adding the missing lines of text, it changed to use the first two lines. However, I changed these to "Equip" and "Costume", anyways, so there's no scrolling when viewing someone else's inventory.