FEATURE: Optionally show local time for user in card (PR #9527)

This adds a site setting (default off) to optionally show a user’s local time and timezone in their user card. For example, I live in Brisbane, and if at 3:30PM my time I were to open a user who lives in California’s card I would see 22:30 (PST).

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We should not be making computed properties dependant on private member variables.

We have to either convert _timezone to be a public variable or remove it from this.

Should probably check for this in an acceptance test.