The jQuery usage uses the below language strings (don't edit the JS files, please restore those).
'ago' => 'ago',
'from now' => 'from now',
'less than a minute' => 'less than a minute',
'about a minute' => 'about a minute',
'%d minutes' => '%d minutes',
'about an hour' => 'about an hour',
'about %d hours' => 'about %d hours',
'a day' => 'a day',
'%d days' => '%d days',
'about a month' => 'about a month',
'%d months' => '%d months',
'about a year' => 'about a year',
'%d years' => '%d years',