Spline UI: improve json exports

Change-Id: I2aac5c6eda3122a627bb99185d0db2b17b3bcd16
diff --git a/frc971/control_loops/python/libspline.py b/frc971/control_loops/python/libspline.py
index 8facbb5..4e68221 100755
--- a/frc971/control_loops/python/libspline.py
+++ b/frc971/control_loops/python/libspline.py
@@ -176,9 +176,9 @@
     def __del__(self):
         libSpline.deleteTrajectory(self.__trajectory)
 
-    def SetLongitudalAcceleration(self, accel):
-        libSpline.TrajectorySetLongitualAcceleration(self.__trajectory,
-                                                     ct.c_double(accel))
+    def SetLongitudinalAcceleration(self, accel):
+        libSpline.TrajectorySetLongitudinalAcceleration(
+            self.__trajectory, ct.c_double(accel))
 
     def SetLateralAcceleration(self, accel):
         libSpline.TrajectorySetLateralAcceleration(self.__trajectory,