Language::getHumanTimestamp does not work. With one Timestamp it just gives the day date (4 april). With another it returns nothing when not logged in, or the full formatted string when logged in (2015-11-30T02:49:14 following date format settings).
It also does not add an 'ago' to the end, nor does it put an amount of days or whatever past (such as '19 days ago', which I would have expected from the 4 april one)
It does, however, follow the date format preferences, which does not make sense either.