In the context of car engines transverse means across the car, i.e crankshaft parallel to front axle.
Yep the French-English dictionary needs a rethink. Perhaps they meant “slice”
I’m not really sure what it means and Asobo could blend the 3 configs into 1 to simplify the UI (Xplane has 1 config).
The developer has looked at the expanded set of permutations and devised a mathematical solution, and operators we don’t quite get, to create any part of the set.
Rip those 3 out and just use one config like Xplane.