Show last commiter's name in the `repo/branches` view (the commit is already shown)

Feature proposal label please.

Summary

As an engineering team manager, I want to see who is working on which branch of the repository, so that I can ... minimise work in progress, maintain order in the repository, see who isn't removing source branches after merges, etc.

Steps to reproduce

Browse to Commits -> Branches, see the branches, with their latest commit (e.g. ab79ebc3), but no committer's name, even on mouse hover.

Possible fixes

Display the committer's name underneath the branch name. Would be great to be able to search by and/or order by the committers name as well.