Ask for a more human friendly message on HAL moderation platform when deposit has an error

SWORD SWH response: Attente maximale atteinte, sans doute un probleme sur SWH... Document en statusdeposited https://deposit.softwareheritage.org/1/hal/263/status/

This error message appears when deposit worker is off and deposit wasn't verified or loaded on HAL platform

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Migrated from T1694 (view on Phabricator)