For those who haven't run across soft-releases before, this is the last step before the final release. Because things haven't been finalized yet, some packages may change between now and the release. It is not recommended to use soft-releases in production.
We will need new versions for plone.app.iterate, plone.app.linkintegrity, plone.app.users and Products.CMFPlone, because of template changes for new msgids to have them translated, and a new version for plone.app.locales too, but I don't know if they should be in this RC4 or later on on the release process.
Thanks for the detailed bug report. I'm going to take the pending tag off of RC4 and we'll plan to cut a new one ASAP to cover the fix for the blocker and any updated translations.