[openstreetmap/openstreetmap-website] Add openplaques:id support and refactor the formatters (#2621)

[mmd]

@mmd-osm commented on this pull request.



> @@ -0,0 +1 @@
+docker-db-data

This commit c3108bd54d009357d5d7d8e76f9655be89ee54f2 doesn't really belong here...

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