Update the language bar

[bear8642]

Describe the issue you are having

Update language bar to include behind

Requires mantis 21700 so tools/lb-gen can correctly update lb.js

[abrudz]

@bear8642 You self-assigned this. How is it going?

[bear8642]

Yes, self-assigned as thought it would be simple to do once Mantis 21700 is completed.

The docs mantis issue is yet to be completed.

[bear8642]

Running the script tools/lb-gen has brought forward other changes to the language bar. Update the issue to reflect the fact that it's not just behind (⍛) that's updated