In UploadWizard, we have a bunch of messages used in the UI to indicate what's going on with the file or the files. We've been using {{PLURAL}} properly, and that was great.

However, there appears to be a bug with core now. I'm only getting the plural version, never the singular one.

I have been unable to pinpoint the source of the error, since apparently the localisation cache helps to befuddle git-bisect. However, I've been generally convinced that it's a core bug because of the constant state of UploadWizard through my testing.

This is blocking me from writing accurate tests for UploadWizard, sadly, so I'd like to solve this problem soon.

Thanks!

Version: 1.20.x
Severity: major