[openstreetmap/openstreetmap-website] Avoid using `to_sentence` to create map key entries (Issue #3816)

[Andy Allan]

In https://github.com/openstreetmap/openstreetmap-website/pull/3731 it was shown that the map key isn't displayed correctly for certain languages.

The underlying cause of the problem is that we are using `.to_sentence` to join individually translated words, which is [unnecessary](https://github.com/openstreetmap/openstreetmap-website/pull/3731#issuecomment-1269667154) and causes this bug.

This issue is here since the original PR was closed, and an alternative PR hasn't yet been created, and we need to ensure that we don't forget about this problem in the meantime.

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