Tools: Rename Curve Shrink/Fatten to Radius

This is fundamentally different from Shrink/Fatten for meshes, because the control points are not moved, only the radius.
Issue raised by Ronan Ducluzeau, name suggested by Campbell Barton

release/scripts/startup/bl_ui/space_toolsystem_toolbar.py

@@ -803,10 +803,10 @@ class _defs_edit_curve:
         )
 
     @ToolDef.from_fn
-    def curve_shrink_fatten():
+    def curve_radius():
         return dict(
-            text="Shrink/Fatten",
-            icon="ops.curve.shrink_fatten",
+            text="Radius",
+            icon="ops.curve.radius",
             widget=None,
             keymap=(),
         )
@@ -1615,7 +1615,7 @@ class VIEW3D_PT_tools_active(ToolSelectPanelHelper, Panel):
         'EDIT_CURVE': [
             *_tools_default,
             None,
-            _defs_edit_curve.curve_shrink_fatten,
+            _defs_edit_curve.curve_radius,
             _defs_edit_curve.curve_vertex_randomize,
             _defs_edit_curve.tilt,
             _defs_edit_curve.draw,