[openstreetmap-website] Replace scale with zoom level in Export tab (#368)

[pnorman]

I've built apps that call the mapnik API directly and *I* don't know how the scale is evaluated. It'd be nice to know what we're replacing.

Is it based on an OCG standard pixel and a scale to meter?

I don't really think zoom level is a great alternative, it's arbitrary and is just a detail of the behind the scenes method of transferring the map from servers to a client.

The best I can think of is meters:pixel

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