I just found SMB has more localizations than selectables on Steam.

Supported Languages:

• English
• Japanese
• German
• French
• Spanish
• Italian
• Korean
• Chinese
• Portuguese

And managed to use hidden language by editing memory.
http://steamcommunity.com/id/iAmGhos...64481106983830

So I've written little loader for this, project page is here:
https://github.com/iAmGhost/SuperMeatBoyMultilangLoader