[openstreetmap/openstreetmap-website] Fix multiple *:wikipedia links (Issue #6397)

[Pablo Brasero]

pablobm left a comment (openstreetmap/openstreetmap-website#6397)

On quick investigation, this seems to be handled by [app/helpers/browse_tags_helper.rb](https://github.com/openstreetmap/openstreetmap-website/blob/master/app/helpers/browse_tags_helper.rb). The method `wikidata_links` is aware of semicolons ([code](https://github.com/openstreetmap/openstreetmap-website/blob/8bd509b7caba7b1b17ee508ae7e049938bf398ba/app/helpers/browse_tags_helper.rb#L119)), but `wikipedia_links` is not.

Are these tags (`subject:wikipedia` and generally `*:wikipedia`) expected to allow multiple values?
- In favour:
	- It would make sense as this instance is trying to link to exactly the same subjects as the Wikidata links, just in their Wikipedia forms.
- Against:
	- As per https://wiki.openstreetmap.org/wiki/Key:wikipedia#Secondary_languages: "In almost all cases, a single wikipedia tag using the primary language for the subject, as described above, is sufficient". In contrast, at https://wiki.openstreetmap.org/wiki/Key:wikidata#Secondary_Wikidata_links we see "In some rare cases where the subject is plural, values will be separated by a semicolon". Neither wording is definitive, with "almost all cases" and "in some rare cases", but only the Wikidata one mentions semicolons.
	- In this specific example, the first link seems relevant ("Schleswig plebiscite"), while I'm not sure that the second one is ("Denmark in World War II").

This seems rare indeed, with only [107 instances](https://qlever.cs.uni-freiburg.de/osm-planet/iIuYQp) for `subject:wikipedia` as I write these lines.

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