Redmine

Extracted from #33339#note-20 by Alexander Meindl with patch:

[...] But it should be a possibility for plugin developers to change css for an individual namespace to the plugin settings (without using deface or Javascript).

If a css class would be added with the plugin name, a plugin developer can change css for the required plugin.

I added a patch for this possible change. It would be very helpful, also for other situations for a Redmine plugin developer.