- Added [GitHub's `relative-time` element](https://github.com/github/relative-time-element) - Converted all formatted timestamps to use this element - No more flashes of unstyled content around time elements - These elements are localized using the `lang` property of the HTML file - Relative (e.g. the activities in the dashboard) and duration (e.g. server uptime in the admin page) time elements are auto-updated to keep up with the current time without refreshing the page - Code that is not needed anymore such as `formatting.js` and parts of `since.go` have been deleted Replaces #21440 Follows #22861 ## Screenshots ### Localized   ### Tooltips #### Native for dates  #### Interactive for relative  ### Auto-update  --------- Signed-off-by: Yarden Shoham <git@yardenshoham.com> Co-authored-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: delvh <dev.lh@web.de>
