Hi, "flow-error-fetch-after-open-lock" is missing i18n in the flow extension.
Searching in GitHub only finds it at https://github.com/wikimedia/mediawiki-extensions-Flow/blob/4092c38e2484b744944f97e1d1923ef42736d9e2/modules/engine/components/board/base/flow-board-api-events.js#L358