Publisher with / in there name are not shown

### Description
Looking for the right name for the publisher of a book I added, I found that there were already a few with slightly different names:

* Editions 10/18 548 books
* 10-18 177 books
* 10/18 85 books
* Éditions 10/18 21 books

When clicking on "10-18" you can see the page of the publisher, but clicking on any other (say "10/18") the "/" in the name is kept as is in the URL, making it a sub-directory of a nonexistent publisher.

### Evidence / Screenshot (if possible)

### Relevant url?
https://openlibrary.org/search/publishers?q=10%2F18&search=&m=edit&has_fulltext=true

https://openlibrary.org/publishers/10/18 compared to https://openlibrary.org/publishers/10-18

### Expectation
I expected to see the publisher info when clicking on the link.

### Details

- **Logged in (Y/N)?**
- **Browser type/version?**
- **Operating system?**

### Proposal & Constraints
Maybe escape the "/" in the URL somehow?

### Stakeholders

Thanks!