Ticket: 1228
## Code changes
- Pass through `getTimeAgoStr` so that the value gets localized.
- Pass the simpler `number` around instead of the `moment` object for better memoization.
## Notable differences
Due to how `getTimeAgoStr` is written, we now get to see the time actually counting down, vs "in a few seconds" currently in production. I think the counting-down behavior was the original intentional, since a 1s timer was used (otherwise, a 1-minute timer could be used) ... or maybe not since streams may not start on the dot.
