Callback: Extra information about layout in the build gui

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Extra information about airport layout in the build gui (155)

This callback allows you to display some extra text in the build airport gui. It should return a D0xx StringID.

GRFv≥8 For GRF version 8 and above you can return 400 to display no text (instead of failing the callback).

This callback is always called when available, you do not need to set a bit in any action0 property to enable it. Available for OpenTTD since r20272