Callback: Layout name
Airport layout name (156)
This callback allows you to show a name for an airport layout. 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 r20273.