Would it be possible to create a Czech version for Czech Wikipedia?
Topic on Talk:MoodBar
Certainly!
In order for this to happen, we'll need to make sure it's been localized into your wiki's language before we can deploy, and then we'll need to see that there is community consensus for deployment.
Localization for the extension can be done at translatewiki; if you need help, you can ask around in #mediawiki on irc.freenode.net.