Remove the 'hippotranslation:translated' mixin from virtual nodes to prevent recursion

I have set fix for at 2.17.02, not sure if this is ok.

Anyhow, currently, the virtual provider for a hippotranslation:translated ends up in showing for example two nodes, say 'en' and 'fr'. These nodes again have the mixin 'hippotranslation:translated', and also a child node: hippotranslation:translations. This child node is again a virtual provider, and can be populated. This makes the structure harder to understand. Most likely, there is also no use case for this 'deeper' structure.

If the virtual provider removes from 'en', 'fr' etc the mixin 'hippotranslation:translated' and if it does not mirror the 'hippotranslation:translations' , I think it would be nicer. Not sure how hard this is to achieve though

Regards Ard