In the Surface Workbench, the command is called `Surface_CurveOnMesh`
and the only thing it does is call the corresponding command
in the MeshPart Workbench, where it is defined
under the name `MeshPart_CurveOnMesh`.
Currently the MeshPart Workbench is not exposed on the graphical user
interface but it is loaded at startup, and its commands
are in fact used from the Mesh Workbench and, in this case,
the Surface Workbench.
Also improve the tooltip of the other commands in the Surface Workbench:
`Cut`, `Filling`, `GeomFillSurface`, `ExtendFace`, and `Sections`.
The `Cut` command does not do anything at this moment
so it is not visible in the interface.
8eb466d3e7