It seems you're the one not reading. It's not allowed to post links to applications like Supermarket on the forum. Go ahead and do a search on Google - or on the forum. You'll find what you're looking for.
Yeah, as soon as I saw your avatar, I knew it was you, didn't even have to check your username. :P
Wow, I just realized I've been using MIUI since April or so but created my forum account just now. Oh, well, at least now I'm here.
Any luck on finding out who to contact about the translation...
It reminds me of HTC_IME which can be found here: http://forum.xda-developers.com/showthread.php?t=624416
It has a lot of options and in my opinion a lot better than the standard Android keyboard that ships with MIUI. There are lots of options to get it to look and feel (more or less?) exactly...
I don't know how much work it is to translate it all, but I'd be happy to help out if needed. I've got way too much free time on my hands.
Oh, and hey Hund. I recognize you from Swedroid. Well, which swedish Android user wouldn't? :)