All 100% completed: MainLoop, Node, Object, Path, Performance,
Reference, Resource, SceneState, SceneTree, UndoRedo.
Also fixed some en_GB occurrences as the reference spelling is en_US.
(cherry picked from commit 867dda1124)
It seems (please correct me if you understand it otherwise) that the description for the `get_skidinfo()` function is the inverse of what actually happens. I have run some simple tests, and it looks like setting low `Friction Slip` (e.g. try `1` or `2`) causes more skidding and returns smaller values for `get_skidinfo()`, while when the `Friction Slip` is increased, the car skids less and values printed to the console increase (get closer to `1.0`). So it seems that a value of `0.0` means skidding, while a value of `1.0` means no skidding (the description says the exact opposite to this, from what I understood).
(cherry picked from commit e9b8ff273d)
