[openstreetmap/openstreetmap-website] Apply lang attribute to localized name:* values (#6834) (PR #6854)

[Marwin Hochfelsner]

@hlfan commented on this pull request.



> @@ -1,4 +1,13 @@
 <tr>
-  <th class="py-1 border-secondary-subtle table-secondary fw-normal" dir="auto"><%= format_key(tag[0]) %></th>
-  <td class="py-1 border-secondary-subtle border-start" dir="auto"><%= format_value(tag[0], tag[1]) %></td>
+  <th class="py-1 border-secondary-subtle table-secondary fw-normal" dir="auto">
+    <%= format_key(tag[0]) %>
+  </th>
+
+  <% lang = tag[0][/^name:([a-z]{2,3}(?:-[A-Z]{2})?)$/, 1] %>

Since we only need to find the substrings most likely to be BCP-47 strings, not validate them, we can go for something a little bit simpler.

I've been trying out some variants; this is my current pick:
`/.+:([a-zA-Z]{2,3}(?:(?:[^a-zA-Z:_'"]\w+)+|\b|$))/`

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