Is this the proper SourceForge link to the front end default template?
https://sourceforge.net/p/jforum2/code/HEAD/tree/trunk/src/main/resources/templates/default/
There seem to be multiple places where one can find a "default" template, as well as multiple places where which are storing JS. For example, another location for a default template is here:
https://sourceforge.net/p/jforum2/code/HEAD/tree/branches/v2.3.6_csrf/src/main/resources/templates/default/
The discussion continues at JGO as to whether to use JForum or Discourse. A key issue is the front-end and how dynamic it is, how well it handles mobile, how easy it is to modify. A number of people think the default look of JForum is dated (they prefer what they see on Discourse or Flarum), so it would be helpful for the JForum advocates to be able to identify the process of editing the front end. The first step is knowing which code is being use! The first link has files that are more recent, but I may also have overlooked another location.