Activity Log: Add clarity to the "users logged in" event

[formosattic]

What

Change the wording so it reflects the correct number of users and logins.

In the below example, it's one user who logged in twice, but the text say 2 users logged in.

Why

The current wording is misleading, and without expanding the details, it can trigger an impression of security concern as we're led to think that some unknown users accessed the site.

Ticket: 8746618-zd-a8c

How

If we're just tracking login events, should we remove the word users and keep it to something like 2 logins?

[github-actions]

Support References

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• 8746618-zen