Nested menues rh

[PixelRobots]

Provide a description of what has been changed

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Fixes #928

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[tomkerkhove]

Can you elaborate on what this change is please?

[PixelRobots]

Looks like perhaps a change is also needed to navbar.html

[PixelRobots]

Can you elaborate on what this change is please?

It hopefully after some more work will fix #928