themes/templates: some duration and/or time displays are using incorrect formatting

[Wessie]

There are several of these, but I don't have a list of them currently. It will probably require an extra function or two passed to the templates

some known ones:

• [x] admin database has very long durations
• [ ] song details have long "time ago" in minutes

will update the list (and feel free to comment) when finding more of these

[Wessie]

server-side rendered times are different than what the javascript renders afterwards