[openstreetmap/openstreetmap-website] Give the changesets_count in changeset metadata (#2224)

[mmd]

You can of course also include the total number of edits made by a user, to have a bit more context:

![edits](https://user-images.githubusercontent.com/5842757/57879807-9292f500-781d-11e9-9970-45b26874d688.png)




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