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091505d17c
Without an Access Key the image search goes through Unsplash's web endpoint, which refuses datacenter addresses with a 401 or 403 or answers with a challenge page. The search then said only "Unsplash search unavailable", although an admin can already enter a free key in the settings. Such a refusal now answers 502 with that hint and the code unsplash_key_needed, and the cover search shows it in the user's language. Closes #1449