[openstreetmap/openstreetmap-website] Confirmation popup for Overpass API export (PR #6411)

[mmd]

### Description

The list below is a bit confusing from a UX point of view. While 3 out of 4 links would take a user to another page with more details about download options, the Overpass API link immediately starts a potentially huge download. The link is followed by a harmless-looking explanatory text that most users will probably overlook.

<img width="174" height="183" alt="image" src="https://github.com/user-attachments/assets/80f58078-301f-45be-ac90-2aa5df3e2fbe" />

To make things a bit clearer, I'm adding a confirmation pop-up for now.

<img width="602" height="286" alt="image" src="https://github.com/user-attachments/assets/8dfb9eb7-2b20-4f1c-81d6-8d1c81956a2a" />

Some UX redesign might be the better approach in the long run.

### How has this been tested?
Local test

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

  https://github.com/openstreetmap/openstreetmap-website/pull/6411

-- Commit Summary --

  * Added confirmation modal dialog for Overpass API export

-- File Changes --

    M app/assets/javascripts/index/export.js (60)
    M config/locales/en.yml (5)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6411.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6411.diff

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