[openstreetmap/openstreetmap-website] Apply `lang` to localized `name:*` values (Issue #6834)

[Arpan Mukherjee]

Arpan200502 left a comment (openstreetmap/openstreetmap-website#6834)

Hi, I’d like to work on this issue.

>From what I understand, localized tag values such as `name:fr`, `name:ja`, etc. are currently rendered without a `lang` attribute, which can affect font selection and screen reader behavior.

My plan is to:

- Identify where localized tags are rendered in the element page view
- Detect subkeys matching language patterns (e.g. `name:<lang>`)
- Extract the language code and apply it as a `lang` attribute in the rendered HTML
- Add tests to ensure correct rendering

I will also look into whether basic IETF language tag validation should be included or if a regex-based approach is sufficient.

Please let me know if this approach sounds reasonable.

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