Hi @jserre 
hmmm, I just tested the same replacement and it worked:
text replacement:
result:
I know sometimes it takes a few minutes for some replacements to take, I think on larger forums perhaps. For some settings, I’ve had to wait a bit then do a page refresh in the browser (for example, it seems to to take a bit longer on a hosted forum than on my local dev instance, where the change is instantaneous). 
Incidentally, if you haven’t seen this already, and for others who might not be aware, there are verbose settings which can help one find translations keys for which text to replace in the admin text replacement console.