I have modified two files (5-10 lines) of the vendor/flarum/core files. The first attempts (pages extension, ...) were completely discarded. I also created the following tags: DE, EN, solved, request and bugs. I use these tags for the icons. The "start discussion" button is only visible in the subcategories. The original Flarum view was unfortunately too confusing for our customers.
I use flarum beta7.x but these small changes can also be used in the latest flarum version.
in progress: responsive, sort, pagein, languages