[openstreetmap/openstreetmap-website] Add locale selector (PR #5201)

[Minh Nguyễn]

@1ec5 commented on this pull request.



> +    <select role="button" class="p-0 position-absolute top-0 start-0 w-100 h-100 language-change-trigger text-transparent bg-transparent <%= classes %>">
+      <% Locale.available
+               .select { |locale| I18n.exists? "shared.language_selector.#{locale}" }
+               .sort_by { |locale| t(".#{locale}") }
+               .each do |locale| %>
+        <option class="form-select" value="<%= locale.to_s %>" <%= "selected" if I18n.locale.to_s == locale.to_s %>><%= t(".#{locale}") %></option>
+      <% end %>
+    </select>

[`Intl.DisplayNames.prototype.of()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/DisplayNames/of) returns undefined if the language code is unrecognized, so we could fall back to the raw code. It only throws an exception on a malformed language code. But if we already have a string that we can access at build time, that would be good too. In that case, we wouldn’t need all those added lines in the YAML file, one for each language…

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