I made a silly name for my first library, then uploaded a bunch of stuff. Now I'm stuck with it. Clearly, my fault, but would be a nice perk feature to allow for editing of library informations.
OK, it is quite easy to implement.
For now you may just delete the library and create a new one. The data won't be deleted so when you upload your files again that would be fast.
Done, see haiwen/seahub@36a3bd1