Hi,
I saw that the Wikipedia logo for Upper Sorbian on
http://wikimediafoundation.org/wiki/Donate/Now/hsb
is still in English. On Commons a Wikipedia logo for Upper Sorbian doesn't seem to exist but there is one at
http://upload.wikimedia.org/wikipedia/hsb/b/bc/Wiki.png
Maybe it wasn't found till now because its name isn't wikipedia-logo-hsb.png but Wiki.png. Perhaps you can take it.
Regards michawiki