UI: rename Cycles point light Size to Radius, for consistency and clarity

Differential Revision: https://developer.blender.org/D7888

intern/cycles/blender/addon/ui.py

@@ -1388,7 +1388,7 @@ class CYCLES_LIGHT_PT_light(CyclesButtonsPanel, Panel):
         col.separator()
 
         if light.type in {'POINT', 'SPOT'}:
-            col.prop(light, "shadow_soft_size", text="Size")
+            col.prop(light, "shadow_soft_size", text="Radius")
         elif light.type == 'SUN':
             col.prop(light, "angle")
         elif light.type == 'AREA':