[openstreetmap/openstreetmap-website] Add copyright/attribution message to downloaded map images (PR #5607)

[mmd]

This PR adds the UI facing parts for https://github.com/openstreetmap/chef/pull/735 and adds WebP as as additional output format, as well as a checkbox to toggle copyright/attribution in the map export.

![image](https://github.com/user-attachments/assets/037f8b7c-a09a-4841-9b8b-8ed9d4667f87)

* Fixes #735
* Depends on https://github.com/openstreetmap/chef/pull/735
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5607

-- Commit Summary --

  * Add copyright/attribution message to downloaded map images

-- File Changes --

    M app/assets/javascripts/leaflet.share.js (20)
    M app/controllers/export_controller.rb (3)
    M config/locales/en.yml (1)
    M test/controllers/export_controller_test.rb (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5607.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5607.diff

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