I'd like to have the block page in my own language; Dutch. When the block page was still only available through the mod from Wally3k, translating that Block Page was pretty easy. Now, I have no idea where to start (other than creating a custom block page, but that seems like a lot more work)
You can find the block page as
/etc/.pihole/advanced/blockingpage.css
/var/www/html/pihole/blockingpage.css
in your file system.