Add railway:signal:position and railway:signal:direction to railway signal preset

[UncleOwen]

Hi,

I added railway:signal:position and railway:signal:direction to the railway signal preset in defaultpresets.xml. While most josm users won't know specifics about railway signalling, they can say which side of the track a signal is located and which way it's pointing.

I'm pretty sure this is the wrong way to add localization, because de.text isn't used anywhere else in the file. Could someone point me to the right location?

The preset itself is copied from https://github.com/OpenRailwayMap/OpenRailwayMap/blob/master/josm-presets/de-signals-eso.xml