I18n partially working in production

I have a problem with i18n in production. I use for form error messages.
I don’t know why but it translates but not everything.

Here is what I get when I submit a not valid form. (french)

Impossible d’enregistrer {{model}}: {{count}} erreurs.

Les champs suivants posent problème :

* {{attribute}} {{message}}
* {{attribute}} {{message}}
* {{attribute}} {{message}}

The attributes aren’t found or something but I works perfectly in

Any idea?

Perhaps different versions of Rails/the i18n gem? Older versions use
and newer versions use %{}.

I think malesca is right you need to have both updated versions.

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