[openstreetmap/openstreetmap-website] Notifier message pluralization (#2431)

[Andy Allan]

Thanks for the PR @rubynho !

There is one change required to your PR. The travis build reports this error, from our `erblint` checks:

```
Style/HashSyntax: Use hash rockets syntax.
In file: app/views/notifier/gpx_success.html.erb:5
```

This means use e.g. `:trace_points => @trace_points` and not e.g. `trace_points: @trace_points`

If you can, please make this change, squash your commits and force-push to your branch. This will ensure there is only one commit in the history for this PR.

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