[openstreetmap-website] Routing: add a progress indicator (#691)

[Matthias Urlichs]

Routing engines sometimes are slow, or not reachable. Please add an in-progress indocator (some spinning GIF or whatever) that's displayed while you wait for the route to be returned.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/openstreetmap-website/issues/691
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