Team download + fix zip sometimes corrupted

[HugoGresse]

• add export on Team page to download all images as zip
• fix zip sometimes corrupted due to accent

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 5bc4855):

• https://conferencecenterr--pr129-team-download-4wrwolfv.web.app
• https://apiopenplanner--pr129-team-download-bmvw4o77.web.app

_{(expires Mon, 08 Jul 2024 19:20:59 GMT)}

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