Do we want to have last render presented in UTC?

[deniederhut]

Currently, the timestamp of the last successful build of a paper is presented next to the download button:

presumably, this is to give some indication of how stale or out of date a build is. From the time offset, this looks like it's currently being rendered in UTC, which might make obfuscate the actual age of the build. Would it make sense to pull in the locale in the js layer and modify appropriately? Or marking these in the template specifically as non-local time?