Production bug fixes and minor improvements

Translation updates.

When displaying a warning that a message is too late to be delivered, and the units of the message are minutes, round the number of minutes down rather than displaying a long floating-point number.

Allow S/MIME to be used with Send Later, because S/MIME works properly with it, but continue to disallow PGP, because PGP doesn't.

Remember the zoom level of the pop-up window between invocations.

When the zoom window is detached, i.e., it's Thunderbird 115 and the Send Later button isn't in the compose window toolbar, remember its dimensions between invocations.

Telemetry fixes:

• Add a couple new telemetry events.
• Fix the telemetry to use the profile's UUID properly instead of putting a separate UUID in every event.
• Include a per-minute nonce in telemetry events to prevent events from getting trapped in the browser cache.