hi Pekele, and welcome to the forum.
I just tested ArtRage 2.2.9 on our Mac here, and 'h' and 'v' do flip horizontally and vertically except when the caps-lock key is on. Looks like we've missed processing the uppercase characters for those keyboard functions.
Can you just check that you haven't got your caps-lock on when you're pressing the 'h' and 'v' keys.
It's still a bug - we should be processing both 'h' and 'H' and 'v' and 'V' for those commands, so I'll add a bug to the buglist and ensure it's fixed before next build.
Regarding layer translations: They're on our 'to do' list for a future release, but I'm not sure when they'll be added.
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"