[Tails-l10n] Weblate scheduled downtime: Dec 14th 2023

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Hello, dear translators!

We'll need some downtime for upgrading Weblate, and intend to do that on
Thursday Dec 14th 2023.

Please beware that the application will be brought down somewhen during
that day and will only be brought back up after it's upgraded and stable
once again.

Thanks for translating Tails!
- Tails Sysadmins

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