Delete the .svn directory inside guess_language/ and it is the parent (if it also came from another SVN repository). This should allow you to add it to another SVN repository.
This also needs to be done recursively through children's guess_language . A command that can do this for you (depending on your Linux environment):
find . -name '.svn' -type d -exec rm -rf {} \;
(You probably shouldn't just take it for granted, test it with a non-removable version, i.e. find . -name '.svn' -type d and make sure that the listed directories only are the ones you want to delete.)
Grundlefleck
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