"Translate this page" not working

[lb803]

The "Translate this page" link does not work ever since we migrated the editions to s3.

This is an example of the URL associated to the button:
https://translate.google.com/translate?sl=auto&tl=af&u=https%3A%2F%2Fbooks.openbookpublishers.com%2F10.11647%2Fobp.0265%2Fch1.xhtml&sandbox=1

I investigated the issue a little bit, and I noticed that the same URL without the file name works just fine:
https://translate.google.com/translate?sl=auto&tl=af&u=https%3A%2F%2Fbooks.openbookpublishers.com%2F10.11647%2Fobp.0265/&sandbox=1