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
Many site settings can be distructive or have huge side-effects for a site that the admin may not be aware of when changing it. This commit introduces a `requires_confirmation` attribute that can be added to any site setting. When it is true, a confirmation dialog will open if that setting is changed in the admin UI, optionally with a custom message that is defined in client.en.yml. If the admin does not confirm, we reset the setting to its previous clean value and do not save the new value.