[FIX] base: fr translation corrupted import datetime error message

[bplancher]

Description of the issue/feature this PR addresses:

When importing data, datetime related errors are corrupted by FR translation.

The source string contains %%(field)s variable, but fr translation changed it to %%(fields)s.
This causes weird error : KeyError : u'fields'
This fix only rename variable to %%(field)s in the FR datetime message.

Current behavior before PR:
When importing data, when a datetime related error is raised, we only see u'fields' on the displayed error messages, nothing more useful.

Desired behavior after PR is merged:
When importing data, when a datetime related error is raised, we see the real error : MM/DD/YYYY does not seem to be a valid datetime for field FIELD on the displayed error messages.

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[mart-e]

Hello,

Thanks for the contribution but please check translation documentation, the translations are handled on Transifex, not Github.

Please submit your changes there and let me know if you have issues.

Thanks

[bplancher]

Hello,

Thanks for your reply.
I added the suggestion on your FR Transifex project.

Have a nice day !