[openstreetmap/openstreetmap-website] Add headline to heatmap (PR #5976)

[rkoeze]

### Description
Adds dynamic headline to heatmap. Addresses https://github.com/openstreetmap/openstreetmap-website/issues/5810.
<img width="964" alt="Screenshot 2025-04-29 at 10 22 42 PM" src="https://github.com/user-attachments/assets/af4b5e9d-f9e3-4ea7-aada-5dd43150c42e" />

### How has this been tested?
On my local machine I've verified that the header works as expected in the case that a user has 0, 1, and >1 contributions.


You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5976

-- Commit Summary --

  * Calculate changeset count
  * Add strings
  * Add header
  * Add tests

-- File Changes --

    M app/controllers/users_controller.rb (2)
    M app/views/users/show.html.erb (5)
    M config/locales/en.yml (3)
    M test/controllers/users_controller_test.rb (29)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5976.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5976.diff

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