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Resolved Are these missing phrases related to showcase?

Alert opt out phrases are prefixed with alert_opt_out. followed by the content type eg, sc_update followed by the alert action eg insert (with an underscore between the content type and action.

Those phrases were added in SC 3.2.22, so not sure why yours are not parsing.
They do exist (just ran a new install of Showcase and all 3 of those exist). Maybe download the Showcase 3.2.22 package again (to make sure you have the updated package) and run the upgrade again (which will process the XML as an update).