[openstreetmap/openstreetmap-website] Add kilometers/miles switch to directions (PR #5915)

[Anton Khorev]

@AntonKhorev commented on this pull request.



>      } else {
-      return OSM.i18n.t("javascripts.directions.distance_km", { distance: Math.round(m / 1000) });
+      const ft = m / ftSize;
+      const mi = m / miSize;
+      if (ft < 1000) {

I'm not doing 0.1 miles because it's going to one significant digit too soon. I tried different boundaries and I chose:
- `minorValue < 1000 || majorValue < 0.5` for total distance
- `minorValue < 1500 || majorValue < 0.5` for step distance

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