User gets "No Subscriptions" page when clicking on opt-in link a second time.

[errolt]

Is your feature request related to a problem? Please describe.
Users get confused when they click a second time on the opt-in link and see a page with "No Subscriptions. There are no subscriptions to confirm. " screen.

Describe the solution you'd like
Change to "This email address has already been confirmed." or something similar. In other words a "positive statement" (you have already completed this step) instead of a "negative statement"(Nothing to do here).

[github-actions]

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