R1:7cbaad5cd18d

Fix some edge strings; particularly revision editing

Summary:
These didn't get translated quite right:

- We need to use `$total_count` because some languages have different words for 1, 2-3, and 4+ things (for example). So the strings might translate as:
- alincoln added a reviewer-one ...
- alincoln added reviewers-few ...
- alincoln added reviewers-many ...
- That is, while English has only "reviewer" and "reviewers", other languages have more plural forms, and "reviewer", "reviewers…