use highway=busway instead of emergency=yes when determining feature type in query results

[tguen]

Problem

In query results, features with highway=busway and emergency=yes are listed only as "yes" in query results.

For example, this one shown below.

Description

No response

Screenshots

[mmd-osm]

New entry for highway=busway to be added here: https://github.com/openstreetmap/openstreetmap-website/blob/master/config/locales/en.yml#L920

[mmd-osm]

According to https://github.com/openstreetmap/openstreetmap-website/blob/master/CONTRIBUTING.md#nominatim-prefixes, "I18n keys under the geocoder.search_osm_nominatim" are managed by Nominatim maintainers.

I'm not exactly clear how this was done in the past. Maybe @lonvia can help here.

[lonvia]

Feel free to add new entries. And feel free to make a PR to get of this section in CONTRIBUTING.md.