Add confirm action when sending emails on Android

[ermis]

In Thunderbird Android, it's easy to send an email by mistake, because there is no confirmation when you tap on the send button.

Furthermore, the send button is near the attachment one, so there is a significant probability of tapping on the wrong button, with no way to undo the mistake.

Please, add an "are you sure you want to send?" popup.

[Jon]

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