OK, let's go. As for me, I can prepare the Czech translation. I cannot speak for my German friend, who was interested in Muse proper, but IDK if she is going to work on Muse Monitor as well.
By the way. Slavic languages have a strange way of forming plurals. We usually have specific plural for 2, 3 or 4 objects, and specific plural for 5 and more. For example
1 postel (one bed)
2, 3, 4 postele (2, 3, 4 beds)
5, 6, 7... posteli (5, 6, 7 beds)
The source code must count with this strange property of Slavic languages if it is to display messages correctly (like "You get 3 points" vs. "You get 5 points").