en locale errors.template.header wrongly reported as having broken data

[digitalfrost]

thor locales:test en

wrongly reports that the key errors.template.header has broken data.

The data for the keys:

• looks fine
• is en.yml so should be the reference version and not broken
• is the same as in en-GB which if tested does not report the keys as having broken data

[digitalfrost]

      header:
        one: 1 error prohibited this %{model} from being saved
        other: "%{count} errors prohibited this %{model} from being saved"

If %{model} is deleted from the two lines the keys are not reported as being broken

[digitalfrost]

I am not sure this key is still in rails.
I can't seem to find it via grep

[jlduran]

It still exists (somewhat):
https://github.com/rails/rails/blob/791f109d97a38f8b9fe8a8c3d6d0a7acd70f1edb/railties/lib/rails/generators/erb/scaffold/templates/_form.html.erb.tt#L4

Fixed in #1087.